The last slave revolt in Belize took place in 1820 on the Belize and Sibun rivers. The Superintendent declared martial law because a "considerable number of slaves" were well armed. He sent troops up the river. He discovered that "the Negroes who had first deserted and had excited others to join them, had been treated with very unnecessary harshness by their owner, and had certainly good grounds for complaint".
About ten days after the revolt began, Superintendent Arthur offered rewards for the apprehension of two black slaves, Will and Sharper, who were supposed to be the leaders. He offered "a free pardon to any of the other runaways, who will at this time voluntarily come in and deliver themselves". This revolt lasted for about one month.