In his history of the Abraham Lincoln Brigade -a battalion of American's who fought in the war alongside the Republican army- Peter Carroll describes the role the Lincoln's played in the battle:
The Americans fell under heavy sniper fire from the hovering church tower and immediately began to count heavy casualties. By the end of the first day, all the company commanders and many of the adjutants had been killed.
...In one assault 22 men started towards the town. None made it; only two survived.