For the day that was in it

For the day that was in it: Giuseppe Ungaretti's "Mattino" (Morning):

MATTINO

M'illumino
d'immenso

Giuseppe Ungaretti was an Italian modernist poet who fought in WW1 and managed to survive and continue to write poetry. Like the great Wilfred Owen, he wrote about the horror of the trenches, though with perhaps less pessimism, as in the couplet above (you don't have to know Italian to get the gist of it, or to admire the music). I can't think of a more powerful two-word poem, and many longer poems don't hold a candle to it. 

Another poem, more directly about the war, is the following:

VIGIL

An entire night
thrown down
beside a
butchered
companion with his
grimacing
mouth turned
to the full moon
with his congested hands
thrust
into my silence
I wrote
letters full of love
I have never held
so hard
to life