Once again, the choppiness of lines 6-7 mimics the terseness of tired men.
The rhythm of the lines even sounds a bit like the tramp of men marching in rhythm.
Plus the repetition of "l"s continues.
Notice how we've moved beyond the elaborate similes at the beginning of this stanza.
Our speaker's not worried about comparing his comrades to things that the folks at home can understand.
Worn out by the march, he's content to speak in sweeping observations.
All the men are rendered disabled by the traumas that they've experienced.
Maybe this isn't exactly an accurate historical account of a soldier's life in the war.
After all, all of the men can't be lame and blind, can they? Or…can they?
Perhaps the "drunk" and "deaf" soldiers might be temporarily overwhelmed by the never-ending strains of battle.
Even the shells seem "tired" and "outstripped."
(Five-Nines are gas shells. We'll hear lots more about them later.)
The whole war, in other words, seems worn out.