"I thought it was about killing people and devastating real estate and non-combatants," Heemi said.
"I had an issue about war."
For decades he was filled with grief, but in recent years, his grandchildren had helped him see his service - and Anzac Day - in a new light.
He travelled from Ruatahuna, a remote village deep in Te Urewera National Forest, to Tauranga to attend Wednesday morning's dawn service at the Tauranga RSA.
"Now my grandchildren are asking me questions so I have had to redefine these rituals for myself, in that I must now think about the new dawn - my grandchildren.
"Now [Anzac Day] means going forward with something positive.
"It's about leaving my grief behind. Not forgetting it but remembering so I can step forward on another new journey.
"Out of destruction now I can see a new rebuilding."