What are the literary devices used in "The Man He Killed" by Thomas Hardy, other than irony?

One of the things that stands out clearly about this poem
is the way in which Hardy has deliberately crafted a poem that is bare of literary
devices and presents us with a very straightforward description of a wartime scene and a
soldier's musings. You are right in identifying the irony in this poem. However, apart
from this, there are no other instances of literary devices. It is as if Hardy has
deliberately tried to strip bare his poetry of such techniques to present his message as
directly and bluntly as possible. Thus the poem focuses in on the immense irony of the
last stanza:

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Yes; quaint and curious war is!
You
shoot a fellow down
You'd treat, if met where any bar is,
Or help to
half a crown.

War is indeed
"quaint and curious." It brings about a completely unnatural situation where men are
ranged against each other and trying to kill each other, when otherwise they would be
happy to buy each other a drink in an inn. Using a very simple style, stripped bare of
literary devices, Hardy thus emphasises this message through this
poem.