The Duke and Duchess of Sussex unveiled a statue in Fiji to honour Sgt Talaiasi Labalaba, a British-Fijian war hero who died fighting the Dhofar Rebellion in Oman.
Labalaba, a member of Britain's elite Special Air Service, was killed in 1972 during the Battle of Mirbat in Oman.
He helped save other soldiers from the rebels backed by Yemeni communist insurgents by single-handedly firing a 25-pound heavy gun that usually took several soldiers to operate.
He continued for more than two hours, even after his jaw was shot off, before he was eventually shot and killed. His heroics were not widely known until recently because the British were not officially involved in the conflict.
Afterwards, the British royals arrived Thursday on the Island of Tonga, where people gathered at the airport to welcome them wearing traditional outfits, playing guitars and singing.
Prince Harry and Meghan were greeted by Princess Angelika Latufuipeka.
They were later scheduled to meet with Tonga's king and queen and to attend a reception and dinner featuring traditional Tongan entertainment.
Meghan stepped off the plane wearing a red dress while Harry wore a light beige suit.
The couple is on the 10th day of a 16-day tour of the South Pacific that has already taken in Australia. They will end their tour with four days in New Zealand.