AR SOUDARDED ZO GWISKET E RUZ
Language of origin: Brezhoneg/Breton

From the same webpage, but entered by a different reader, an English translation.

THE SOLDIERS ARE DRESSED IN RED

The soldiers are dressed in red,
The priests are dressed in black.

The best soldier in the army,
'Ar Fur' is his name.

He says to his comrades:
'I don't think I will die.

'But if I die in combat,
Bury me on holy ground.

'If I die in the house of my father
Bury me in the village of Brissac.

'In Brissac, in the middle of the cemetery
Where I planted a fir tree for my cross.

'A fir tree for my cross I planted
Never a [pine] needle was missing on the tree!'

But this year the tree is down,
Soldier 'Ar Fur' is dead.

And we began to dig the earth
While Bretons were crying.

The soldiers are dressed in red,
The priests are dressed in black.

also from: lyricstranslate.com