A remembrance service has taken place with the Union Flag flying beside the Irish Tricolour for the first time at such an event in Northern Ireland.
The ceremony ended with a minute's silence for the fallen
People from across Ireland stood at the cenotaph in Londonderry to remember men from both sides of the border who died fighting for British forces.
Glen Barr, who works to promote reconciliation through remembrance, said it was an important day.
He said the flags have flown at events in Belgium without any controversy.
"We're saying it's great if we can do it in Belgium, now we have to start to be doing it in Ireland and that's exactly what we're starting to do," he added.
Those attending the service included members of the Ancient Order of Hiberians, Royal Dublin Fusillers and Irish UN representatives.
They stood alongside representatives from the Royal British Legion and a contingent from Belgium as the flags were lowered by veterans while the Last Post played.
Wreaths were laid at the cenotaph and the ceremony ended with a minute's silence for The Fallen.