Pillbox 20 was perhaps the largest and most heavily armed fortification on the hill. A turret, mounting a cut-down 88 mm cannon, revolved 360 degrees on top, while the concrete walls were thick. The structure was manned by 45 soldiers with no less than 6 machine-guns. Following a communications trench from number 19 to 20, he threw two satchel charges through a steel door that an ammunition-laden soldier was entering through. With the destruction of pillbox 20, enemy resistance on Crucifix Hill soon crumbled, allowing allied forces to mop up and secure the 1st Division's flank.