WORLD HISTORY

Base your answer to the following question on the passage below and on your knowledge of social studies ____ A weary, exhausted, nerve-racked group of men it was indeed that, about noon November 1, assembled in a gully north of Sommerance [France] to rest and dig in for the night. The artillery was still firing furiously, but the enemy’s barrage [bombardment] had ceased very suddenly about 10:00 a.m. and now only occasional shells from long-range rifles would explode in thevicinity. The weather was gloomy and the moist air chilled one to the bones. Yet it was with that meticulous [methodical] care that is characteristic of worn-out men, that we prepared our foxholes, carrying boards and iron sheeting from abandoned machine-gunners’ dugouts in order to make our “houses” as comfortable as possible, even though only for one night ____ Source:William L. Langer, Gas and Flame in World War I, Knopf/Borzoi13. Which means of warfare is described in this passage?