The fourth in line to the throne used the social media service to promote ticket sales for the Invictus Games.
The Princes’ tweet – which was sent from the official Invictus Games account – read “Hope everyone will get behind #invictusgames. Great opportunity to support and thank the men and women who have given so much. Harry”.
Harry – who was a former Apache helicopter pilot and served in Afghanistan – is the official President of the games which will run as a Paralympic-style tournament for injured servicemen and women.
The inspirational competition is due to be held in London this September and will involve more than 300 military personnel – some who have lost limbs – from 13 nations, including Afghanistan, Italy and New Zealand.
The event will see servicemen and women compete in sports including athletics, archery, wheelchair basketball, cycling, rugby, swimming and volleyball.
Harry has been committed to his role in promoting the games and last month watched on at the trials for the British team as some of the UK’s fittest military athletes competed for a spot in the 100-person strong national squad.
“The intense physical training and competitive spirit that will be forged inside this team as they prepare to represent their country in the Invictus Games will, I hope, go some way to helping the recovery not only of those who hope to be selected here today, but also inspire others along the way,” the Prince said.
David Henson, who was injured in Afghanistan in 2011 says the games will help veterans to see a life beyond disability.
“These games will provide us, the wounded community, with the tools to create our own futures, to govern our own destinations, to show that we cannot be broken.”
The games are due to kick off on September 14.