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The German counterattack had shattered so much of the 35th Division—a poorly led division, most of whose key leaders had been replaced shortly before the attack, made up of National Guard units from Missouri and Kansas—that it had to be relieved early, though remnants of the division subsequently reentered the battle. Part of the adjacent French attack met temporary confusion when one of its generals died. However, it was able to advance 15 km (9 mi), penetrating deeply into the German lines, especially around Somme-Py (the Battle of Somme-Py (French: Bataille de Somme-Py)) and northwest of Reims (the Battle of Saint-Thierry (French: Bataille de Saint-Thierry)). The initial progress of the French forces was thus faster than the 3 to 8 km (2 to 5 mi) gained by the adjacent American units, though the French units were fighting in a more open terrain, which is an easier terrain from which to attack.
Second Phase (October 4 – 28, 1918)
The second phase of the battle began on October 4, during which time all of the original phase one assault divisions (the 91st, 79th, 37th and 35th) of the U.S. V Corps were replaced by the 32nd, 3rd and 1st Divisions. The 1st Division created a gap in the lines when it advanced 2.5 km (1.6 mi) against the 37th, 52nd, and 5th Guards Divisions. It was during this phase that the Lost Battalion affair occurred. The battalion was rescued due to an attack by the 28th and 82nd Divisions (the 82nd attacking soon after taking up its positions in the gap between the 28th and 1st Divisions) on October 7. The Americans launched a series of costly frontal assaults that finally broke through the main German defenses (the Kriemhilde Stellung of the Hindenburg Line) between October 14–17 (the Battle of Montfaucon (French: Bataille de Montfaucon)). By the end of October, U.S. troops had advanced ten miles and had finally cleared the Argonne Forest. On their left the French had advanced twenty miles, reaching the Aisne River. It was during the opening of this operation, on October 8, that Corporal (later Sergeant) Alvin York made his famous capture of 132 German prisoners near Cornay.
Third Phase (October 28 – November 11, 1918)
By October 31, the Americans had advanced 15 km (9.3 mi) and had finally cleared the Argonne Forest. On their left the French had advanced 30 km (19 mi), reaching the River Aisne. The American forces reorganized into two armies.