It was at first impossible for any one to realize what had actually happened. The smoke and fumes hid everything from sight, and hundreds of men were
thrown into a comatose or dying condition, and within an hour the whole
position had to be abandoned, together with about fifty guns.
- British Field Marshal Sir John French, report on the
second battle of Ypres, 1915
What caused the scene described in this excerpt?
A A tank attacking soldiers on a battlefield
B A poison gas attack on soldiers in the trenches
A submarine attacking a docked ship
D An aerial bombing of an infantry, unit