Gaelic speakers who have seen the movie "the Eagle"...?
Does the language spoken by the Highlanders/Britons in the movie bear any resemblance to any Gaelic tongue that you are familiar with? Is it recognizable in any way? Can you pick out enough words from it that you would find it convincing as an Old Gaelic tongue? I was only able to pick out a couple, such as "Hrall" (thrall) meaning slave, and "mac" meaning son.