What kind of meter is the poem Recalling War by Robert Graves written in?

Iambic pentameter.

The rhythmic structure is of 10 syllables per line, split into five pairs - or 'iambs' with the stress on the second syllable, running thus:
'da-DUM da-DUM da-DUM da-DUM da-DUM'.


As, in the first line 'Entrance and exit wounds are silvered clean,' if it were read in strict iambic pentameter, would run:


'Entrance and exit woundsare silver'd clean'.


I hope that's helpful