Years ago say 1990 I caught a TV program showing Joan Baez singing a song about an immigrant to the US.In the song the immigrant was justifying his right to be a US citizen by singing that his son had
"... fought for the Eagle...".
Joan was singing from notes held in her hand so it may have been a new song or perhaps a song written by another writer.
Iv'e searched for years to no avail.Can anyone help?.