SYDNEY -- Prince Harry kicked off the fourth annual Invictus Games on Saturday by telling veterans to "allow the example of service and determination you will see, to change something big or small in your own lives." In a speech at the Opening Ceremony outside the Sydney Opera House, Harry said those taking part had turned the games into a "symbol of... honour and optimism for a new generation," BBC News reports.

Harry started the Invictus Games in 2014 for wounded warriors. Harry and Meghan made their debut as a couple at the 2017 Invictus Games in Toronto.

Ahead of Harry's speech, Kensington Palace tweeted a photo of him rehearsing for an audience of one: Meghan.

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"I have been so proud to be able to introduce my wife to you and we have been so happy to be able to celebrate the personal joy of our newest addition with you all," Harry said in his speech.

Britain's Prince Harry speaks during the opening ceremony of the Invictus Games at the Sydney Opera House, Sydney, Australia, October 20, 2018. PHIL NOBLE / REUTERS

A thus-far joyous debut royal tour by the couple, buoyed by news that they are expecting their first baby, turned solemn as the Duke of Sussex opened a long-awaited extension to the Anzac Memorial in downtown Sydney's Hyde Park on Saturday morning.

The former British army captain and his wife laid a wreath of Australian native flowers at the steps of the memorial, as Prime Minister Scott Morrison, other dignitaries, and service men and women looked on.

Harry and Meghan were then taken on a tour of the newly remodeled shrine, which was first opened in 1934 by Harry's great-great uncle, Prince Henry, the Duke of Gloucester, but was left incomplete due to a shortage of funds during the Great Depression. A project worth 40 million Australian dollars ($28.4 million) has finally realized the memorial's original design.

In a handwritten signed note pinned to the wreath, Harry wrote, "In memory of those who paid the ultimate sacrifice and in recognition of the men and women for whom the scars endure."

Wearing the tropical dress of his regiment, the Blues and Royals, Harry unveiled a plaque that noted the extension was "opened by a grandson of the Queen."

Britain's Prince Harry and his wife Meghan, Duchess of Sussex, attend the opening ceremony of the Invictus Games at the Sydney Opera House, Sydney, Australia, October 20, 2018. PHIL NOBLE / REUTERS

The wording was a nod to the original plaque Prince Henry unveiled 84 years ago, which noted that the memorial was "opened by the son of a king."

Harry saluted as the Last Post rang out across Hyde Park, while Meghan, in a long black dress by New Zealand designer Emilia Wickstead, stood beside him.

The royal couple later visited Sydney Harbour's Cockatoo Island, where Harry delighted some children by joining them in playing with remote-controlled cars. The couple visited the island to watch an Invictus Games event - the Land Rover Driving Challenge.

Harry later officially opened the games in a ceremony on the Sydney Opera House forecourt that was delayed by an hour after the city was lashed by a late afternoon thunderstorm.

The Invictus Games, Harry's brainchild and the focus of this tour, were founded by the prince in 2014. The sporting event gives sick and injured military personnel and veterans the opportunity to compete in sports such as wheelchair basketball, and to find inspiration to recover.

Harry and Meghan will also visit Fiji, Tonga and New Zealand during their 16-day tour.