Siegfried Sassoon
Eventually Sassoon was sent out to France to fight on the Western Front and was shocked by his experiences there.  He became friends with another poet, Robert Graves, who, although younger than Sassoon, had been at the Front for longer and had grown used to it. He suggested that Sassoon's poetry could be improved if he began to write in a more realistic way about the things he saw and experienced in France, and Sassoon took his advice and changed his style a lot.