sentences:  Then the delayed Bia Expedition of about 350 men arrived from the Free State in the north.As Captain Stairs, the Marquis Bonchamps and Robinson were still incapacitated, it was agreed that Captain Bia would take over the consolidation of Congo Free State control of Katanga, and the Stairs expedition would return by the originally-planned route via Lake Nyasa and the Zambezi.As they left carrying the sick officers in hammocks they experienced some harassment and raids by natives ruled by Lukuku, and the march was exceptionally hard owing to the heavy rains at the end of the wet season (as well as to the continuing illness and weakness of expedition members).