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(CNN) -- Prince Harry tweets for the first time!

The prince sent a message from London's BT Tower Thursday to mark tickets going on sale for the Invictus Games, which he champions.

The international competition organizes special sporting events for wounded, injured and sick servicemen and women.

Tweeting from the Invictus Games account, the prince said: "hope everyone will get behind #invictusgames Great opportunity to support and thank the men and women who have given so much. Harry."

Although he has yet to create his own account, Harry joins a number of royals with a presence on Twitter including Prince Andrew, the Queen, and Prince Charles.

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