It is highly ironical that what Sassoon hated immensely only brought him fame and popularity. He hated war but he got fame by writing about war. But Sassoon is remembered in history for the man who protested against war and openly mentioned about the horrors of war in his writings. Yes, he was frustrated with war and he also endured some personal losses in the war. It is true that after a particular point of time the war was nothing but a drag and it is also equally true that the foot soldiers were the most affected ones as they lost their lives or became handicapped. Sassoon here blames the system, the people in power and the authorities for the loss of life. From his letter it is clear that he is attacking specific people and institutions that he sees as guilty for the war. I do not think that he was shell-shocked.