"The Man He Killed" by Thomas Hardy

Had he and I but met
By some old ancient inn,
We should have set us down to wet
Right many a nipperkin! 
But ranged as infantry,
And staring face to face,
I shot at him as he at me,
And killed him in his place.
I shot him dead because--
Because he was my foe,
Just so: my foe of course he was;
That's clear enough; although
He thought he'd 'list, perhaps,
Off-hand like--just as I--
Was out of work--had sold his traps--
No other reason why.
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.