Hone Tahitahi, who had yet to celebrate his 16th birthday when he enlisted and left New Zealand, survived the war, as did his two brothers. A fourth brother served in World War II, and also came home.
Hone's son Harry Tahitahi, now in his 80s and one of four children who are still alive, attended Saturday morning's service.
Also there, representing the Navy, was Chief Petty Officer John Harrison, whose mother had been born at Te Kao. He had grown up at Whangape, his father's community, and would return there to live when he retired.
CPO Harrison told the service in Kaitaia later in the morning that his grandfather had lied about his age - taking 10 years off - so he could serve in World War I, adding that the commemoration of the centennial of the landing at Gallipoli was proving to be a very emotional day.
He thanked the Far North for its contribution to the New Zealand Defence Force over the last 100 years, and for all it had been to him.