Prince Harry has organised the inaugural Invictus Games in London Getty

Over 400 competitors from 13 nations are set to take part in the Invictus Games, which will take place over the next four days.

An international sporting event for wounded, sick and injured servicemen and women, teams from the armed forces that have served alongside one another will compete in a variety of different sports. Athletics, wheelchair rugby and swimming are just some of the events taking place.

The Invictus Games are being championed by Prince Harry and are designed to use the power of sport to inspire recovery and support rehabilitation.

"The Invictus Games are about survival in the face of adversity and the strength of the human spirit. They will send a positive message about life beyond disability," the website reads.

The inaugural games will take place from 11 to 14 September. A number of Invictus Games events have sold out, while thousands of £12.85 tickets have already been snapped up.

What's the story behind Invictus?

Prince Harry was driven to bring the event to an international audience following his visit to the Warrior Games in Colorado in 2013. Athletes at the event represent Army, Marine Corps, Navy, Air Force and Special Operations.

Invictus Dave Grohl
Prince Harry with the Foo Fighters' Dave Grohl at an Invictus Games Reception at the American Ambassador's Residence in London Getty

Meaning "unconquered" - the name Invictus is designed to embody the "fighting spirit of the wounded, injured and sick service personnel" and what they can achieve post injury.

The poem Invictus by William Ernest Henley, who has a leg amputated due to complications arising from tuberculosis, was written in 1875.

Speaking at a launch event earlier this week, Harry said: "I have had some sleepless nights, I think all of us have.

"We have had some nervous moments, but we're at this stage now where there is no going back and together what we have achieved in such a short a space of time is fantastic."

"I'm at the stage of my life now where over the last couple of years I have realised what a difference it can make, and using the position to good - something I have tried to do for many years of my life, but this is a classic example."

The Jaguar Landrover driving challenge, the first event in the Invictus Games took place on 9 September in Gaydon. Gold medals were presented to Sarah Archibald and Matthew Taxis of Australia.

When is the opening ceremony?

The opening ceremony, presented by Jaguar Land Rover, will begin at 6.30pm at the Queen Elizabeth Olympic Park on 10 September. The BBC will be providing coverage of the event from 7pm to 8pm, on a One Show Special on BBC1.

The official anthem to the games will be performed by Coldplay's Chris Martin, and the event has been put together by Kim Gavin, the creative director of the 2012 Summer Olympics closing ceremony.

There will be a fly past from The Red Arrows and displays by The King's Troop Royal Horse Artillery, as well as other military-themed spectacles.

The closing concert, which features performances from the Foo Fighters and Kaiser Chiefs, sold out in under an hour - selling around 26,000 tickets.

The BBC coverage schedule for the games can be seen here.