One of his toughest war-poems, in my opinion, is the one below. It isn't remotely as famous as Wilfred Owen's "Dulce et Decorum Est," and it isn't tough in the same way; the poem by Owen, in addition to skewering easy notions of patriotism and of dying for one's country, presents a graphic "battle" scene--which is mainly a scene of soldiers being hit by poison gas. Sassoon's poem is tough because it is directed at--and gives hard advice--to one who grieves. It is one of the most emotionally unflinching poems I know. If one didn't have the sense that Sassoon had earned the right to compose such a poem and the sense that what he writes is true, one might be tempted to think of the poem as cruel. It is a hard poem, a tough poem, certainly a sobering poem about war--but not a cruel one. It is from his book Picture Show (1920).
Reconciliation
By Siegfried Sassoon
WHEN you are standing at your hero’s grave,
Or near some homeless village where he died,
Remember, through your heart’s rekindling pride,
The German soldiers who were loyal and brave.
Men fought like brutes; and hideous things were done;
And you have nourished hatred, harsh and blind.
But in that Golgotha perhaps you’ll find
The mothers of the men who killed your son.