Owen uses metaphor to give the reader a more relatable and clearer picture of the events taking place in the poem. "Men marched asleep" describes how tired and weary the soldiers were, and also how unaware of their surroundings they were at this point in the text. "Drunk with fatigue" and "deaf to even the hoots of tired, outstripped Five-nines" both support the atmosphere being created in the start of the poem. Later, in the text, when the men are all submitted to gas and one soldier cannot put his helmet on in time, we see him "drowning"