Siegfried Loraine Sassoon (8 September 1886 – 1 September 1967) was an English poet, author and soldier. Decorated for bravery on the Western Front, he became one of the leading poets of the First World War. His poetry both described the horrors of the trenches, and satirised the patriotic pretensions of those who, in Sassoon's view, were responsible for a vainglorious war. He later won acclaim for his prose work, notably his three-volume fictionalised autobiography, collectively known as the "Sherston Trilogy". Motivated by patriotism, Sassoon joined the British Army just as the threat of World War I was realised, and was in service with the Sussex Yeomanry on the day the United Kingdom declared war (4 August 1914). He broke his arm badly in a riding accident and was put out of action before even leaving England, spending the spring of 1915 convalescing.