Mohammed's Koran: Why Muslims Kill For Islam

123. As with Boko Haram and Islamic State today, the Mahdi army of the
     1880s flew the black flag of jihad; those who helped the Mahdi were
     known as the Ansar [Helpers], the same word used to describe those who
     helped the founder of Islam when he became a thief, slave-taker and killer
     on his move from Medina to Mecca. See
     https://en.wikipedia.org/wiki/Charles_George_Gordon#Mahdist_uprising

. ↵