Private August Rawiri embarked with A Company, 3rd Maori Contingent on 5th February 1916.  He served with the NZ Maori (Pioneer) Battalion in France and was gassed and wounded during the Battle of Messines.

He was invalided home aboard HMNZHS "Marama" arriving in Auckland on 22nd August 1917. He subsequently died in Napier Hospital and was buried in the Waiohiki Maori Cemetery.