according to "Am Baile", Murdo Maclean returned from Montana in 1907 and wrote Soraidh leis a' Chóigich in 1910. Source of info. is the book already mentioned, Gibson, Rob. Plaids & Bandanas (2003) The book Highland Cowboys: From the Hills of Scotland to the American Wild West by Rob Gibson (2014) gives 1907 as the date of return but says Maclean composed the song before he returned to Scotland

Along with lyrics and translation (which are already posted here, though I havent checked for any differences in transcription) this link includes a video of Fiona Mackenzie singing Soraidh leis a' Chòigich: http://www.ambaile.org.uk/detail/en/41303/1/EN41303-mo-shoraidh-leis-a-cha//Am