The Scots within the beleaguered garrison regularly sang the Burns song Green grow the rushes O. The Mexicans outside, hearing this time after time, called the hidden singers whose language was foreign, Gringos – or ‘green go’s.http://forargyll.com/2010/04/jim-mather-unveils-memorial-to-fallen-scots-at-el-alamo/Read the full article to see the reference baove