Heavily equipped Germans, using farmers' access roads for their armor, broke the Rangers into ever smaller groups and captured them or annihilated them in detail. By the end of the day, the 1st and 3d Ranger Battalions had ceased to exist. Only 6 of the 767 men who had infiltrated to Cisterna made their way back to friendly lines. All the others had been killed or captured.
http://www.flashman.com/Cisterna.htm