Sassoon's bitterness against the war is made clear through his poetry, which is filled with his resentment against war, the futility of it and the high price that had to be paid.
Sassoon's feelings towards the officers are best described in the poem 'Base Details'. In this poem, Sassoon shows his resentment towards the officers by describing them drinking in the best hotels, and reading the names of those who died, saying 'poor young chap . I used to know his father well' and saying 'yes, we've lost heavily in this last scrap'. The poem is finished with the lines .
"and when the war is done and youth stone dead, I'd toddle safely home and die - in bed".
This poem truly shows the bitterness and resentment Sassoon felt towards the officers. He felt that they didn't really care about those who died, because they were safe themselves and had no idea of what was going on at the front line - calling the battle that was fought a 'scrap', like it was nothing more than a small fight. In the last two lines of the poem, Sassoon's feelings are clearer than ever, the way he says that they'll 'toddle home and then die in bed shows that he thought that the officers were safe and living comfortably while the soldiers, who were actually fighting the war, were living in shocking conditions, where they would die at any moment.
Sassoon uses many different ways to convey his feelings, and particularly his bitterness and resentment towards the war and the officers, but in all his poems, his true meanings are clear and he writes in such a way that shows us clearly what he thinks and feels about the war.