Division and planned its attack for 21 July. Day 4: Sunday, 21 July 1918 During the night of 20/21 July, the Moroccan 1st Division was relieved by the French 87th Division on the right flank of 1st Brigade, 1st Division. A regiment of the French 69th Division was pushed forward to reinforce the French 153rd Division. This was done to advance their attack to protect the left flank of 2nd Brigade, 1st Division as they attacked Berzy-le-Sec. The American 1st Division attack plan for 21 July was the same as the one for the previous day with the addition of a rolling barrage commencing at 4:45am, with the attacking forces following. However, the attack was complicated by the commander of the French 69th Division. He declared his inability to attack at so early an hour and demanded a three-hour artillery preparation. This meant that the American 1st Division had to maintain liaison with the French 87th Division which was attacking at 4:45am and the French 153rd Division which would attack at 8:30am. In order to address this situation, 1st Brigade was sent forward in liaison with the French 87th Division. In addition they retired their left to protect their flank which was also covered by intense supporting artillery fire. Buck spent the night of 20/21 July going from shell hole to fox hole along the front line to explain the attack order for that day. Each commander was given a copy of a sketch map outlining the area of attack. The attack was to be made in three waves with the first wave to be led by Sorenson and the second wave following in support. The third wave was made up mostly of machine gunners who were directed to set up at the edge of Ploisy Ravine. While Buck was explaining the attack orders to his commanders, the Germans were reinforcing their position with the German 46th Division. To the south, a heavy artillery preparation beginning at 4:30am preceded the ground attack of the French 87th Division at 6:00am. By 6:45am the Germans were driven across the Soissons – Château-Thierry road south of Villemontoire. Short-firing artillery hampered the German defenses and counterattacks as Buzancy changed hands several times during the day. The German 5th Division arrived mid-afternoon with orders to retake the high ground east of Charentigny. While the attack failed to accomplish the objective, the German 5th Division managed