Opened in thousands for their blood; and the green slopes
Chasmed and steepened sheer to infinite space.
Of them who running on that last high place
Leapt to swift unseen bullets, or went up
On the hot blast and fury of hell's upsurge,
Or plunged and fell away past this world's verge,
Some say God caught them even before they fell.
But what say such as from existence' brink
Ventured but drave too swift to sink.
The few who rushed in the body to enter hell,
And there out-fiending all its fiends and flames
With superhuman inhumanities,
Long-famous glories, immemorial shames—
And crawling slowly back, have by degrees
Regained cool peaceful air in wonder—
Why speak they not of comrades that went under?
This is a rhythmically balanced line, contrasting the ‘glories’ of war with the endless or ‘immemorial’ shame of having killed. It is an emphatic line constructed so that it can only be spoken slowly. ‘Long-famous glories’ contains long vowels and alliterative ‘g’s and 'l’s. Likewise 'immemorial shames’ is slow and has a dignified rhythm. It ends with a dash that forms a  caesura , a break that enables the reader to ponder with horror the significance of what the fighting has done to the souls of the men. 
