Prince Harry with Malcolm Turnbull

Picture: @InvictusSydney/twitter

Prince Harry urged the world to draw strength from the "inspiring" Invictus Games as he paid tribute to victims of the London Bridge terror attack.

Speaking at the launch event marking 500 days until Sydney hosts the 2018 games, the Prince explained why he founded the Invictus Games four years ago and spoke of his guilt at having to leave the battlefield in Afghanistan:

"In February 2008, I was forced to leave Afghanistan. I had been serving as an army officer in the British army until my presence on the front line leaked out into the press.

"I could no longer stay with my soldiers as it would have put them at greater risk.

"It was a decision over which I had no control but the guilt at having to leave my guys behind was hard to swallow as anyone who has served would understand."

Prince Harry Speaking at Sydney Invictus Games Launch
Picture: @InvictusSydney/twitter

Harry said that it was while waiting for his flight home that he was inspired to find a way of supporting the veterans who were returning home with injuries:

"While we waited to board, a coffin of a young Danish soldier was put on the plane, and three soldiers in induced comas, all three wrapped in plastic, some with missing limbs and tubes coming out everywhere.

"The sacrifices we ask our men and women to make came home so powerfully to me in those moments."

The prince also paid a touching tribute to the Australian victims of the London Bridge terror attack and said:

"In these challenging times, we can all benefit from positive and inspiring stories from which to draw strength.

"The Invictus Games shows us that it is possible to overcome adversity, and that the impossible is possible, if you have the will."

"This spirit, championed by the games, extends far beyond the competition; when a bomb left a number of people with life-changing injuries in Manchester last month, wounded veterans, including Invictus team members, immediately offered themselves up to provide advice and support to the victims through their recovery process."