sentences:  Although the Union Army's most significant foreign-born contingents comprised Irish- and German-Americans, regiments such as the 79th New York Highlanders, initially formed in the 1850s, consisted completely of descendants of Scottish immigrants before accepting Irish, English and others into its ranks during the early years of the war.These immigrants had been living in the US for years before the war.Communication difficulties, especially in Union regiments, were a constant problem in divisions made up of varied nationalities.