In the book Historical Southern Families, Volume IV by John Bennett Boddie, there is a listing of the "Heroes of the Alamo." He shows 187 names all of whom died at the Alamo. Of the 187, he lists 54 as Scottish-Americans. Six of the 54 are shown as native-born Scots.
(Continued research may increased the total of those who died to 259)
John McGregor was a piper and died during the siege of the Alamo in 1836. His Scottish ancestry has been a source of debate, but some researchers insist that McGregor was born at Dull, near Aberfeldy, Scotland, and immigrated first to Canada's Prince Edward Island in 1808. It is reported that the Clan Gregory Society believes he may have been been a direct descendant of Rob Roy, himself. Any additional information would be appreciated.
At the Alamo, McGregor and Davy Crockett held musical competitions - McGregor on the bagpipes and Crockett on the fiddle. It was reported to have been a "strange and dreadful sound."
Note: There is also controversy about the death of Davy Crockett. Some believe that he died inside the Alamo, surrounded by dead soldiers of the Mexican army. Some believe that he and several others were captured and taken to Santa Anna, who gave his soldiers permission to kill them.