The Duke of Sussex attended a remembrance gathering in Brackley, Northamptonshire, near the Oxfordshire boundary, after returning to the UK with his wife, Meghan.
Photographs showed him among the crowd wearing military medals and a poppy.
The Duke served actively in the military from 2005 until 2015.
During that period, he completed two deployments in Afghanistan: ten weeks in Helmand Province in 2007–2008, followed by twelve weeks with the Army Air Corps.
Harry established the Invictus Games in 2014 following his army career.
Held every two years, the international multisport competition brings together serving and former military personnel who have been wounded, injured or become ill.
He and Meghan withdrew from royal duties in January 2020 before relocating to the US.
Subsequent media comments reportedly created tension within the Royal Family, including with Prince William.
In August 2026, the Duke returned to the UK with Meghan and their two children.
He is believed to have settled in the Cotswolds.
Images also captured him conversing with local residents while observing the Remembrance Sunday commemorations in Brackley.
The first Armistice Day ceremony was held on 11 November 1919 in the grounds of Buckingham Palace after the First World War, during which approximately one million soldiers fighting for Britain were killed.
Remembrance observances have since expanded and are now held in villages, towns and cities throughout the UK.