Bent-double, like old beggars under sacks, Knock-kneed, coughing like hags, we curse through sludge, Till on the haunting flares we turned our backs, And towards our distant rest began to trudge, Men marched asleep, many had lost their boots, But limped on, blood-shed. All went lame, all blind; Drunk with fatigue; even deaf to the hoots Of gas-shells dropping softly behind
The rhyme scheme of the first stanza is ____________
