French President Francois Hollande has urged people to fight global threats to peace with the "same vision, the same courage" as those who fought on D-Day, reports the BBC.
Almost 2,000 veterans joined world leaders at a ceremony in Normandy, France, marking the 70th anniversary of the momentous World War Two mission.
Mr Hollande said today's threats included terrorism, global warming and mass unemployment.
Earlier, the Queen laid a wreath at a military cemetery in Bayeux.
The main commemoration event took place at Sword Beach, one of five landing points for the Allies, where scenes from the 1944 invasion were re-enacted.
The landings - involving 156,000 troops - were the first stage of the invasion of Nazi-occupied Europe.
Read more of this report from the BBC.