Siegfried Sassoon
By 1917, many of Sassoon's friends, and his brother, had been killed and he had become very angry about the war.  As a result of several acts of bravery, he had been awarded the Military Cross, but he did not see this as a great honour.  When he was sent home to get better from a wound, he met people who were against the war, and, after listening to their ideas, he began to believe that the politicians were making the war last longer than it needed to, instead of using chances to make peace with the Germans.  He decided not to return to his regiment at the end of his time away from the war.  Feeling very depressed and angry, he wrote a letter to his commanding officer, explaining that he was not coming back because he wanted to protest about the war.