that sounds like a good lead
start here Gaelic resource database

Blàr means a battle. Armed with this song title I found some lines by Alasdair MacFhionghain (of the Gordon Regiment) at another Comhairle nan Eilean Siar page(which will take me time to read!)Ailean an Earachd
"Bha an leòmhann colgarra gun ghealtachd,
Le mhìle fear sgairteil làimh rinn;
An Camshronach garg on Earachd,
Mar ursainn chatha 's na blàraibh."

So George, does this look like it could be the same song? You really didn't tell us much about the song as you know it.