Thanks for THE MAID OF MONTEREY GUEST,henryp I have tried to find information which sets this song in September but have not managed to find anything I guess the following link Battle of Monterrey from Wikipedia https://en.wikipedia.org/wiki/Battle_of_Monterey is about the correct battle but it gives the date of the battle as 7 July 1846. Can you post something which links the song to the month of September, please?