The War Memorial Hall was opened by the Minister of Māori Affairs Ralph Hanan on 18 March 1961. Ngāti Rua hapū were presented with a memorial tablet by the Auckland branch of the 28th Māori Battalion Association. Bishop Wiremu Panapa and the Rev. Rangi Ehu unveiled the memorial tablet inside the hall which reads:
Dedicated to the memory of servicemen Māori and Pākehā who gave their lives in three wars.
Boer War 1899-1902
World War I 1914-1918
World War II 1939 – 1945
The War Memorial Hall was built by Ngāti Rua uri under the supervision of Pine Taiapa featuring carvings, tukutuku and kōwhaiwhai depecting the history of Ngāti Rua hapū.
Prior to the development of the War Memorial Hall a memorial cenotaph had previously been erected on the marae. A white-painted column mounted on a stepped concrete base and surmounted by a funerary urn. The original inscription read as follows:
“He Whakamahara Tanga Mo
Pte. H.O. Coleman / Pte. P. Tai / L/C J.S. Johnson / Pte. T. Tupura / Pte. W. Moore / Pte S. Moore
They shed sweat and / blood for us”.
Sometime after 1978, additional names were added:
“In loving memory, World War II, Vietnam
Coleman, H. Sgt [indecipherable] / Coleman, J.T. Cpl. / Coleman, N. Pte.
Te Hau M. Sgt. / O.B.E. J.P. B.A. / Mihaere H. Pte / Mihaere K. Pte.
On the eastern side of the marae stands a granite memorial stone, paying homage to those lost during the Second World War.
Private Peter Tai, Corporal J.S. Johnson, Private Jack Tai and Flying Officer J.P. Morgan.
Source: Journal of the Polynesian Society ; New Zealand History
In April 2018 the War Memorial Hall, and the adjoining dining hall Hine-i-kauia, saw the completion of an exterior restorative painting project in preparation for the Ōpōtiki Anzac Day commemoration to be hosted by Ōmarumutu Marae. The project was made possible by the help and support of the Urutawa Warriors, contributions to the Ngāti Rua Fundraising account and Ngāti Rua whānau.