plan was working in that Kesselring's reserves had been drawn south. The three divisions of Lieutenant General McCreery's X Corps sustained some 4,000 casualties during the period of the first battle. Main attack: II Corps in the centre, 20 January The central thrust by the U.S. 36th Division, under Major General Fred L. Walker, commenced three hours after sunset on 20 January. The lack of time to prepare meant that the approach to the river was still hazardous due to uncleared mines and booby traps and the highly technical business of an opposed river crossing lacked the necessary planning and rehearsal. Although a battalion of the 143rd Infantry Regiment was able to get across the Gari on the south side of San Angelo and two companies of the 141st Infantry Regiment on the north side, they were isolated for most of the time and at no time was Allied armour able to get across the river, leaving them highly vulnerable to counter-attacking tanks and self-propelled guns of Generalleutnant Eberhard Rodt's 15th Panzergrenadier Division. The southern group was forced back across the river by mid-morning of 21 January. Keyes pressed Walker to renew the attack immediately. Once again, the two regiments attacked but with no more success against the well dug-in 15th Panzergrenadier Division: the 143rd Infantry Regiment got the equivalent of two battalions across, but, once again, there was no armoured support, and they were devastated when daylight came the next day. The 141st Infantry Regiment also crossed in two battalion strength and, despite the lack of armoured support, managed to advance . However, with the coming of daylight, they too were cut down and by the evening of 22 January, the 141st Infantry Regiment had virtually ceased to exist; only 40 men made it back to the Allied lines. Rick Atkinson described the intense German resistance: The assault had been a costly failure, with the 36th Division losing 2,100 men killed, wounded and missing in 48 hours. As a result, the army's conduct of this battle became the subject of a Congressional inquiry after the war. II Corps try north of Cassino: 24 January The next attack was launched on 24 January. The U.S. II Corps, with 34th Infantry Division under Major General Charles W. Ryder spearheading the attack and French colonial troops on its right flank, launched an assault across the flooded Rapido valley north of Cassino and