Ahmad made his name fighting a rival imperial power the "infidel" government loyal to the Ottoman Sultan - just as Bin Laden cut his teeth against the Soviets, before turning against America.
The British government, and even Gordon, underestimated the threat posed by Ahmad until it was too late and the garrison at Khartoum had been annihilated.
Ahmad was not killed in a British raid - he died of typhus. But Lord Kitchener destroyed his tomb to prevent it becoming a rallying point for disciples and had his bones thrown into the Nile.
Kitchener is said to have retained the skull as a paperweight.
There are lessons from Ahmad's movement - he had chosen three deputies to succeed him who they began squabbling as soon as he died. The movement unravelled as a result.
Ahmad's tomb was, however, subsequently rebuilt.
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http://www.absoluteastronomy.com/topics/Muhammad_Ahmad