The royal revealed 'one of the worst speeches' he had ever given.
Prince Harry recently revealed that he felt nervous before he gave his speech for the first Invictus Games in September 2014.
In a video posted on the Sussex Royal Instagram, the 34-year-old opened up about how he felt on the first day of the Invictus Games (the London Paralympics event he founded in 2014) and admitted to having "nerves about everything."
The Duke of Sussex also said he was especially anxious about his speech at the opening ceremony as he felt that he had a short window to get the words out.
"On the night, we had the lecture or podium right in front of all the competitors so I could just see all their faces, and they started chanting," Prince Harry recalled.
"I was so nervous. I was shaking."
Harry - who is married to Meghan Markle and is a father to infant Archie - claimed it was "one of the worst speeches" he had ever given.
WATCH: Prince Harry reveals the reason for one of his worst speeches
On a lighter note, he also revealed that his favourite Invictus Games moment was the U.K. victory over the U.S. in wheelchair basketball during the first event.
On Tuesday, the Duke attended a reception for past and present competitors and their families at The Guildhall.
According toPeople, Buckingham Palace said the party "celebrates the power of the Invictus Spirit in changing people’s lives and demonstrate the leading role of the Invictus Games Foundation in delivering and inspiring recovery and rehabilitation through international sport and competition."
The Invictus Games are comparable with the U.S. Warrior Games, which, according to the publication, Prince Harry was inspired by after travelling to Colorado to watch a British team compete at the games in 2013.
Prince Harry speaks during the opening ceremony for the Invictus Games in 2014.
In 2017 the Invictus Games were held in Toronto, Canada – when Harry made his first public appearance with the future Duchess of Sussex, Meghan — and last year in Sydney, Australia, shortly after the couple had announced that they were expecting their son Archie.
The 2020 Invictus Games will take place in The Hague, The Netherlands.