American corps (about 14 American and 3 French divisions) on a front extending from Port-sur-Seille westward around the bulge to Watronville. Three American divisions would remain on the Vesle front.

(8

Meanwhile Allied forces, including American units operating in other sectors of the Western Front, were making significant gains in the preliminary phases of the great final offensives. For the sake of clarity, the role of American units in the Somme Offensive August-11 November), Oise-Aisne (18 August-11 November), and Ypres-Lys (19 August-11 November) Campaigns will be described briefly, before considering in more detail the activities of the main body of A.E.F. troops in the St. Mihiel (12-16 September) and Meuse-Argonne (26 September-11 November) Campaigns.

Somme Offensive Campaign, 8 August11 November 1918. On 8 August 1918 the British began limited operations with the objective of flattening the Amiens salient. This attack marked the beginning of the great Somme Offensive, which continued until hosilities ceased on 11 November. The British Fourth Army, including the American 33d and 80th Divisions, struck the northwestern edge of the salient in coordination with a thrust by the French First Army from the southwest. No artillery barrage preceded the attack to forewarn the enemy. Some 600 tanks spearheaded the British assault, which jumped off during the thick fog. The completely surprised Germans quickly gave up 16.000 prisoners as their positions were overrun. Ludendorff himself characterized 8 August as the "Black Day of the German Army." The Germans were forced to fall back to the old 1915 line. where they reorganized strong defensesin-depth. Haig then shifted his attack farther north to the vicinity of Arras on 21 August, forcing the Germans to withdraw toward the Hindenburg Line. By the end of the month they had evacuated the whole of the Amiens salient.

The drive to breach the main Hindenburg Line began at the end of September. The American II Corps (27th and 30th Divisions), forming part of the British Fourth Army, attacked the Ger

man defenses along the line of the Cambrai-St. Quentin Canal, capturing heavily fortified Bony and Bellicourt on the 29th. By 5 October the offensive had broken through the Hindenburg Line, and the Allied forces advanced through open country to the OiseSomme Canal (19 October). During this phase of the operations the 27th and 30th Divisions alternated in the line. When the American II Corps was relieved on 21 October, it had served 26 days in the line and suffered 11,500 casualties.

The British advance in the Somme region continued until the Armistice, constituting the northern arm of Foch's great pincers movement on the Germans' vital lateral rail communications system. The key junction at Aulnoye, southwest of Maubeuge, was reached on 5 November. A total of about 54,000 Americans participated in the Somme Campaign.

Oise-Aisne Campaign, 18 August-11 November 1918. In mid-August the French started a series of drives on their front, which extended about 90 miles from Reims westward through Soissons to Ribecourt on the Oise River. These operations continued into late September, when they merged into Foch's great final offensive of OctoberNovember. Five French armies (from right to left the Fifth, Sixth, Tenth, Third, and First) advanced abreast, in coordination with the British on the Somme to the north and the Americans to the east.

The American 32d Division was a part of the French Tenth Army, which spearheaded the penetration of the enemy's main line on 22 August. The 32d was instrumental in the capture of Juvigny on 30 August, which secured tactically important high ground for the Allies. The German front was so badly breached that the enemy was compelled to abandon the Vesle River line. On 9 September the 32d Division was ordered east to join the American First Army.

The American III Corps (28th and 77th Divisions) was a part of the French Sixth Army east of Soissons, which held in late August the western part of the Vesle River sector extending from Braine to Courlandon. As the

Germans retired from the Vesle northward to the Aisne valley in early September, the III Corps took part in the aggressive pursuit operations. Its two divisions carried out successful local attacks, but failed to break into the German line before they were relieved to join the American First Army-the 28th on 7-8 September and the 77th on 14-16 September.

No American divisions participated in the subsequent Oise-Aisne operations, which by 11 November had carried the French armies to the Belgian border. A total of about 85,000 Americans took part in the Oise-Aisne Campaign.

Ypres-Lys Campaign, 19 August-11 November 1918. That part of the Western Front extending from the English Channel south through Ypres, and thence across the Lys River to the vicinity of Arras, was manned by an army group under King Albert of Belgium composed of Belgian, British, and French armies. In late August and early September the British Second and Fifth Armies, assisted by the American II Corps (27th and 30th Divisions), wiped out the Lys salient. When the Germans began retiring in the sector south of the Lys in October to shorten their lines, King Albert's army group attacked along its entire front. By 20 October Ostend and Bruges had been captured and the Allied left was at the Dutch frontier. In mid-October Pershing dispatched two American divisions-the. 37th and 91st-to the French Army of Belgium, at Foch's request, to give impetus to the drive to cross the Scheldt (Escaut) southwest of Ghent. A general attack began in this area on 31 October and continued intermittently until hostilities ended on 11 November. The 37th Division forced a crossing of the river southeast of Heurne on 2 November and another farther north at the site of the destroyed HermelgemSyngem bridge on 10 November. Casualties of the two divisions in these operations totaled about 2,600. From 19 August to 11 November about 108,000 Americans participated in the YpresLys Campaign.

St. Mihiel Campaign, 12-16 September 1918. By September 1918, with both the Marne and the Amiens salients eliminated, there remained but one major

threat to lateral rail communications behind the Allied lines-the old St. Mihiel salient near the Paris-Nancy line. Active preparations for its reduction began with the transfer of Headquarters First Army, effective 13 August, from La Ferté-sous-Jouarre in the Marne region to Neufchâteau on the Meuse, immediately south of St. Mihiel. On 28 August the first echelon of headquarters moved closer to the front at Ligny-en-Barrois.

American units from Flanders to Switzerland were shifted into the area near the salient. The fourteen American and four French divisions assigned to the First Army for the operation contained ample infantry and machinegun units for the attack. But because of the earlier priority given to shipment of infantry (at the insistence of the British and French) the First Army was short of artillery, tank, air and other support units essential to a well-balanced field army. The French made up this deficiency by loaning Pershing over half the artillery and nearly half the airplanes and tanks needed for the St. Mihiel operation.

Shortly before the offensive was to begin, Foch threatened once again to disrupt Pershing's long-held desire to carry out a major operation with an independent American force. On 30 August the Allied Commander in Chief proposed to exploit the recently gained successes on the Aisne-Marne and Amiens fronts by reducing the size of the St. Mihiel attack and dividing the American forces into three groups-one for the salient offensive and two for fronts to the east and west of the Argonne Forest. Pershing, however, remained adamant in his insistence that the First Army should not now be broken up, no matter where it might be sent into action. Finally a compromise was reached. The St. Mihiel attack was subordinated to the much larger offensive to be launched on the MeuseArgonne front in late September, but the First Army remained intact. Pershing agreed to limit his operations by employing only the minimum force needed to reduce the salient in three or four days. Simultaneously he was to prepare his troops for a major role in the Meuse-Argonne drive.

The St. Mihiel offensive began on 12 September with a three-fold assault on the salient. The main attack was made against the south face by two American corps. On the right was the I Corps (from right to left the 82d, 90th, 5th, and 2d Divisions in line with the 78th in reserve) covering a front from Pont-à-Mousson on the Moselle westward to Limey; on the left, the IV Corps (from right to left the 89th, 42d, and 1st Divisions in line with the 3d in reserve) extending along a front from Limey westward to Marvoisin. A secondary thrust was carried out against the west face along the Heights of the Meuse, from Mouilly north to Haudimont, by the V Corps (from right to left the 26th Division, the French 15th Colonial Division, and the 8th Brigade, 4th Division in line with the rest of the 4th in reserve). A holding attack against the apex, to keep the enemy in the salient, was made by the French II Colonial Corps (from right to left the French 39th Colonial Division, the French 26th Division, and the French 2d Cavalry Division in line). In First Army reserve were the American 35th, 80th, and 91st Divisions.

Total Allied forces involved in the offensive numbered more than 650,000some 550,000 American and 100,000 Allied (mostly French) troops. In support of the attack the First Army had over 3,000 guns, 400 French tanks, and 1,500 airplanes. Col. William Mitchell directed the heterogeneous air force, composed of British, French, Italian, Portuguese, and American units, in what proved to be the largest single air operation of the war. American squadrons flew 609 of the airplanes, which were mostly of French or British manufacture.

Defending the salient was German "Army Detachment C," consisting of eight divisions and a brigade in the line and about two divisions in reserve. The Germans, now desperately short of manpower, had begun a step-by-step withdrawal from the salient only the day before the offensive began. The attack went so well on 12 September that Pershing ordered a speedup in the offensive. By the morning of 13 September the 1st Division, advancing from the east, joined hands with the 26th Division, moving in from the west, and

before evening all objectives in the salient had been captured. At this point Pershing halted further advances so that American units could be withdrawn for the coming offensive in the Meuse-Argonne sector.

This first major operation by an American Army under its own command took 16,000 prisoners at a cost of 7,000 casualties, eliminated the threat of an attack on the rear of Allied fortifications at Nancy and Verdun, greatly improved Allied lateral rail communications, and opened the way for a possible future offensive to seize Metz and the Briey iron fields.

Meuse-Argonne Campaign, 26 September-11 November 1918. At the end of August Marshal Foch had submitted plans to the national commanders for a final offensive along the entire Western Front, with the objective of driving the enemy out of France before winter and ending the war in the spring of 1919. The basis for his optimism was the success of Allied attacks all along the front in August. Furthermore, he pointed out, the Allies already had active operations in progress between the Moselle and Meuse, the Oise and Aisne, and on the Somme and Lys Rivers. Foch acknowledged that the Germans could stave off immediate defeat by an orderly evacuation combined with destruction of materiel and communications. Therefore the overall aim of the fall offensive would be to prevent a step-by-step enemy retirement. As Foch anticipated, the Germans eventually contributed to the success of his strategy. Their High Command could not bring itself to sacrifice the huge stores collected behind the front lines, and so delayed the withdrawal of its armies.

Foch's great offensive, planned to begin in the last week of September, called for a gigantic pincers movement with the objective of capturing Aulnoye and Mézières, the two key junctions in the lateral rail system behind the German front. Loss of either of these junctions would hamper seriously the German withdrawal. Despite grumbling from the English that they lacked the necessary manpower, a chiefly British army was assigned the task of driving toward Aulnoye. (See above, Somme Offensive Campaign.) The A.E.F. was

designated for the southern arm of the pincers, the thrust on Mézières. Simultaneously the Belgian-French-British army group in Flanders would drive toward Ghent, and the French armies in the Oise-Aisne region would exert pressure all along their front to lend support to the pincers attack.

Pershing decided to strike his heaviest blow in a zone about 20 miles wide between the Heights of the Meuse on the east and the western edge of the high, rough, and densely wooded Argonne Forest. This is difficult terrain, broken by a central north-south ridge that dominates the valleys of the Meuse and Aire Rivers. Three heavily fortified places-Montfaucon, Cunel, and Barricourt-as well as numerous strong points barred the way to penetration of the elaborate German defenses in depth that extended behind the entire front. This fortified system consisted of three main defense lines backed up by a fourth line less well-constructed. Pershing hoped to launch an attack with enough momentum to drive through these lines into the open area beyond, where his troops could then strike at the exposed German flanks and, in a coordinated drive with the French Fourth Army coming up on the left, could cut the Sedan-Mézierès railroad.

The task of assembling troops in the concentration area between Verdun and the Argonne was complicated by the fact that many American units were currently engaged in the St. Mihiel battle. Some 600,000 Americans had to be moved into the Argonne sector while 220,000 French moved out. Responsibility for solving this tricky logistical problem fell to Col. George C. Marshall, Assistant Chief of Staff, G-3 (Operations), First Army. In the ten-day period after St. Mihiel the necessary troop movements were accomplished, but many untried divisions had to be placed in the vanguard of the attacking forces.

On the 20-mile Meuse-Argonne front where the main American attack was to be made, Pershing disposed three corps side by side, each with three divisions in line and one in corps reserve. In the center was the V Corps (from right to left the 79th, 37th, and 91st Divisions with the 32d in reserve), which would strike the decisive blow. On

the right was the III Corps (from right to left the 33d, 80th, and 4th Divisions with the 3d in reserve), which would move up the west side of the Meuse. On the left was the I Corps (from right to left the 35th, 28th, and 77th Divisions with the 92d in reserve), which would advance parallel to the French Fourth Army on its left. Eastward across the Meuse the American front extended in direct line some 60 miles; this sector was held by two French Corps (IV and II Colonial) and the American IV Corps in the St. Mihiel sector. Pershing had available to support his offensive nearly 4000 guns, two-thirds manned by American artillerymen; 190 light French tanks, mostly with American personnel; and some 820 aircraft. 600 of them flown by Americans.

The Meuse-Argonne Offensive falls into three phases. During the initial phase (26 September-3 October) the First Army advanced through most of the southern Meuse-Argonne region, captured enemy strong points, seized the first two German defense lines, and then stalled before the third line. Failure of tank support, a difficult supply situation, and the inexperience of American troops all contributed to checking its advance.

In the second phase (4-31 October) the First Army, after the inexperienced divisions had been replaced by veteran units, slowly ground its way through the third German line. The enemy was forced to throw in reserves, drawn from other parts of the front, thus aiding the Allied advances elsewhere. In the face of a stubborn defense, American gains were limited and casualties were severe, especially as a result of the newly devised enemy tactic of attacking frontline troops with airplanes. First Army air units retaliated with bombing raids which broke up German preparations for counterattacks. By the end of October the enemy had been cleared from the Argonne and First Army troops were through the German main positions. Two notable incidents of this phase of the campaign were the fight of the "Lost Battalion" of the 77th Division (2-7 October), and the feat of Corp. (later Sgt.) Alvin C. York, who single-handedly killed 15 Germans and captured 132 on 8 October.

In mid-October the organization of the Second Army was completed, at Toul in the St. Mihiel sector, to provide means for better control of the lengthening American front and solutions of the diverse tactical problems that it presented. Pershing assumed command of the new army group thus formed.

Before the third and final phase (1-11 November) of the offensive got under way, many of the exhausted divisions of the First Army were replaced, roads were built or repaired, supply was improved, and most Allied units serving with the A.E.F. were withdrawn. On 1 November First Army units began the assault of the now strengthened German fourth line of defense. Penetration was rapid and spectacular. The V Corps in the center advanced about six miles the first day, compelling the German units west of the Meuse to withdraw hurriedly. On 4 November the III Corps forced a crossing of the Meuse and advanced northeast toward Montmédy. Elements of the V Corps occupied the heights opposite Sedan on 7 November, thus finally accomplishing the First Army's chief mission-denial of the SedanMézières railroad to the Germans. Marshal Foch, at this juncture, shifted the First Army left boundary eastward so that the French Fourth Army might capture Sedan, which had fallen to the Prussians in 1870. American units were closing up along the Meuse and, east of the river, were advancing toward Montmédy, Briey, and Metz, when hostilities ended on 11 November.

General Pershing summarized the results of the Meuse-Argonne Campaign, the greatest battle in American history up to that time, in his Final Report: "Between September 26 and November 11, 22 American and 4 French divisions, on the front extending from southeast of Verdun to the Argonne Forest, had engaged and decisively beaten 47 different German divisions, representing 25 percent of the enemy's entire divisional strength on the western front. . . . The First Army suffered a loss of about 117,000 in killed and wounded. It captured 26,000 prisoners, 847 cannon, 3,000 machineguns, and large quantities of material." More than 1,200,000 Americans had taken part in the 47

day campaign.

ON

AMERICAN OPERATIONS OTHER FRONTS, 1918-1920. Late in the war, American units participated on a limited scale in campaigns in Italy and Russia. The 332d Regiment with attached hospital troops was sent from the A.E.F. to the Italian Front in July 1918 for the morale effect which it was hoped that the sight of Americans would have on the Italians. This force of about 1,200 men took part in the last great Italian offensive against the Austrians, the Battle of Vittorio Veneto (24 October-4 November 1918).

Two Allied expeditions were sent into Russian territory after the Bolsheviks made peace with the Central Powers in March 1918. Elements of the 85th Division (339th Infantry and supporting units) formed a part of the Allied force, under British command, dispatched by sea to the Murmansk-Archangel area in the late summer of 1918, with the mission of preventing Allied military supplies accumulated there from falling into the hands of the Bolsheviks. The more than 4,000 American troops took an active role in the operations until they were withdrawn in August 1919. A similar Allied expedition was sent to the Vladivostok area of Siberia in the summer of 1918 to prevent Japan from acting unilaterally there, secure the eastern section of the Trans-Siberian Railroad, and aid Czechoslovak soldiers, liberated from czarist prison camps, in their escape eastward along the railroad. The American contingent, comprised of the 27th and 31st Infantry regiments and supporting units, arrived at Vladivostok from the Philippine Islands and San Francisco in August and September 1918. These units (about 10,000 men in all) stayed in Siberia until April 1920, taking part in many of the skirmishes with the Bolsheviks in that area.

THE ARMISTICE. In early October 1918 Ludendorff informed his government that victory was no longer possible. Germany immediately started negotiations through President Wilson, requesting an armistice based on the "Fourteen Points," the principles announced by Wilson on 8 January 1918 as the basis for an enduring peace. These negotiations continued until early