Our trial of tears: The story of Ihumatoa' By nancyngu_ 1845 Pledged to defend the township from possible attack. 1863 Invasion of Waikato heartland. Jul 9, 1863 Dated ultimatum was issued. Jul 12, 1863 British troops crossed Mangatawhiri river. 1927 Royal commission found that a grave injustice was done. 1985 Waitangi tribunal concluded that Tainui people never rebelled but were attacked by British troops. 1995 The crown apologised to Tainui for the loss of lives. 1999 Manukau city council purchased 100 hectare site.