The conflict , which overlapped the wars in Waikato and Tauranga , was fuelled Cause_change_of_position_on_a_scale by a combination of factors : lingering Māori resentment over the sale of land at Waitara in 1860 and government delays Change_event_time in resolving Resolve_problem the issue ; a large-scale land confiscation policy launched Process_start by the government in late 1863 ; and the rise of the so-called Hauhau movement , an extremist part of the Pai Marire syncretic religion , which was strongly opposed Agree_or_refuse_to_act to the alienation of Māori land and eager to strengthen Māori identity .