Siegfried Sassoon was an English poet, writer, and soldier born on September 8, 1886. He is best known for his war poetry, which vividly depicted the horrors of World War I. Sassoon served as a lieutenant in the British Army and was awarded the Military Cross for bravery. His experiences in the trenches deeply influenced his literary work. After the war, Sassoon became an outspoken critic of the conflict and its management, leading to his famous anti-war stance. His notable works include the poetry collections Counter-Attack and The Complete Poems of Siegfried Sassoon. He passed away on September 1, 1967.