Milne became a contributor and later assistant editor for the humorous British magazine "Punch". His son Christopher Robin was born in 1920. Milne joined the British army in World War I but after the war wrote a denunciation of war titled "Peace with Honour[?]" (1934) (which he retracted somewhat in 1940 with "War with Honor[?]"). In 1925, he bought a country home, Cotchford Farm[?] in Sussex. This farm is where he retired to after brain surgery in 1952 left him an invalid.
He is most famous for his Pooh books, which feature a boy named Christopher Robin, after his son, and various characters inspired by his son's stuffed animals, most notably the bear named Pooh. A Canadian black bear named Winnie (Winnipeg), used as a military mascot and left to London Zoo after the war, is said to have been the source of the name for Milne's most famous character. E. H. Shepard illustrated the original Pooh books.
After Milne's death, rights to the Pooh characters were sold to the Walt Disney Corp., which has made a number of cartoon movies out of them and merchandise.