The characters are perhaps best known from Lewis Carroll's Through the Looking-Glass and what Alice Found There (1871). Carroll, having introduced two fat little men named Tweedledee and Tweedledum, quotes the nursery rhyme, which the two brothers then go on to enact. They agree to have a battle, but never have one. When they see a monstrous black crow swooping down, they take to their heels. The Tweedle brothers never contradict each other, even when one of them, according to the rhyme, agrees to have a battle. Rather, they complement each other's words, which led John Tenniel to portray them as twins in his illustrations for the book.