CH: BATTLE Ypres to disable 4 miles GB line = psych weapon
TA: 1-2mph and 9/49 across NML at BATTLE Somme but 476 BATTLE Cambrai
AR: Good for creeping barrage, GR Big Bertha used against fortress at BATTLE Verdun, used from trenches
Overall: new tactics made, more mobility, machine guns were useful, bombings damaged morale