Two unknown Australian soldiers and an unknown British soldier have been laid to rest more a 100 years after they were killed together on the Western Front during World World One.
About 200 people attended the funeral at Belgium's Tyne Cot Cemetery on Tuesday for the three men who died together at Broodseinde Ridge during the Third Battle of Ypres in 1917.
Their remains were discovered two years ago during construction works and despite extensive forensic analysis, they have not been identified.
A Defence spokesperson told AAP two of the bodies had the unmistakable Australian Defence Force rising sun badges with them when they were found.
The third man belonged to the Lancashire Fusiliers.
The trio was given full military honours at the service on a warm autumn Tuesday afternoon at the world's largest Commonwealth war cemetery.
Australian Veterans Affairs Minister Darren Chester, who scattered soil on the soldiers' coffins, described how the ceremony had touched him.
"You see these unmarked graves and it's a long line of headstones, but you see a coffin and you think, 'this is a person, three people in fact, that have died in the Great War','" he told AAP.
"So it becomes very real, very quickly."
At the end of the service Australian Defence Force troops and three British Lancashire Fusiliers fired a triple volley into the sky.
Australian Army Corporal Sebastien Buerich, one of the pallbearers, said it was a once-in-a-lifetime experience for him.
"When we were carrying the coffin there was a definite chill down my back thinking about the people that we were carrying, the soldiers that we were carrying and the sacrifices that they made so we can have the lifestyle that we do," he told AAP.
"This sort of service and seeing the respect and care we have for these soldiers, even though they're unknown, will reassure families that if their families are found they will get the same level of care."
Mr Chester said the funerals were a mark of respect but should also give the any descendants of missing soldiers some hope.
"They think that perhaps one day the answer might be given to their mystery, their own family mystery or perhaps they think that is my uncle, my great grandfather, my relative," he said.
"It does give some sort of hope to people that we still treat these remains with an enormous amount of respect in 2018."
The two Australians join 1369 Australian soldiers buried at Tyne Cot, included 791 who remain unidentified.
The Lancashire Fusilier has also been buried there among the graves of 11,955 other Commonwealth troops.