Four years before, the Zanzibaris had thought the Congo deadly and impassable, and warned Stanley not to attempt to go there, but when Tippu Tip learned in Zanzibar that Stanley had survived, he was quick to act. Villages throughout the region had been burned and depopulated. Tippu Tip had raided 118 villages, killed 4,000 Africans, and, when Stanley reached his camp, had 2,300 slaves, mostly young women and children, in chains ready to transport halfway across the continent to the markets of Zanzibar.