And in his address, Charles added: "My hope is today we can re-dedicate ourselves to a future free from intolerance and conflict. We do this in honour of the memory of those who fought and died here so long ago."
Charles spoke of the sacrifice of Pakeha and Maori soldiers in the battle, and told how New Zealand suffered a casualty rate of nearly 60 per cent.
He said: "Measured against the enormity of this suffering and sacrifice, our presence here today may seem small and insignificant.
"Yet we gather with pride and humility to remember the service of all who fell or were injured here."
Afterwards, Charles spoke to flag bearers, members of the public and the New Zealand defence force kapa haka group.
A poppy drop was made from two replica First World War planes following a two-minute silence to remember the loss of lives during the bloody 141-day offensive.
Charles spoke to young people from New Zealand and the Pacific Islands who are in France learning about their countries' involvement in the battle.
Charles was appointed Field Marshal of the New Zealand Army in August last year. He was presented with a warrant recognising the appointment in Wellington.
The Battle of the Somme, which started on July 1 1916, took a brutal toll on New Zealand's 15,000-strong division in what was the country's first major engagement on the Western Front.
During the offensive, which involved the use of poison gas shells and relentless artillery fire, 2,000 of the New Zealand Division died and nearly 6000 men were wounded.
In September and October alone, more than 1500 men from the New Zealand Division were killed. Some 1200 have no known grave and their names are inscribed on the memorial in Longueval.
The British Army suffered almost 60,000 casualties on the first day alone and more than a million men would be killed or wounded on both sides over the course of the 141 days.
