Many of the 91 Tongans who fought served in the Maori Battalion, or were mixed into the Niuean, Rarotongan and Fijian contingents.
Sione Talia'uli (memorialised as "Jione") enlisted in early 1915, served on a hospital ship, and fought in France, Egypt and Palestine with the 3rd Maori Contingent. On top of fighting which earned him the Victory Medal and the British War Medal, Mr Talia'uli was expected to work as a Niuean/Rarotongan translator too.
Mr Talia'uli died of pneumonia in Egypt on October 11, 1918 bequeathing his medals to his child Bakelo. Mr Talia'uli missed seeing the Armistice by exactly one month.
Mr Talia'uli is buried with other NZEF Kiwis, in Ramleh Cemetery in Israel.
Christine Liava'a is a relative who described Mr Talia'uli on a Ramleh Cemetery message board as "the only full-blooded Tongan killed in the war".
Her book, Valiant Volunteers: Soldiers from Tonga in the Great War, is the definitive record of Tonga's contribution.
Men serving the Pacific Islander contingents of the NZEF had come from as far as the Gilbert and Ellice Islands. While Samoans, Niueans and Cook Islanders were returned to lands governed by New Zealand, anyone who wanted to return to Tonga had to beg. War pensions were given out begrudgingly, too - while many lump sums were doled out, other veterans had to wait until the 1920s for payment.
The Tongan RSA's WWI Memorial lists just 50-odd names. Still, in a war which killed 17 million people, every contribution counted.
Click here to read the first 35 stories.