My eyes catch ruddy necks
Sturdily pressed back -
All a red brick moving glint.
Like flaming pendulums, hands
Swing across the khaki -
Mustard-coloured khaki -
To the automatic feet.
We husband the ancient glory
In these bared necks and hands.
Not broke is the forge of Mars;
But a subtler brain beats iron
To shoe the hoofs of death,
(Who paws dynamic air now).
Blind fingers loose an iron cloud
To rain immortal darkness
On strong eyes.

Isaac Rosenberg

http://www.poemhunter.com/poem/marching-as-seen-from-the-left-file/