Phrase Origin: Go to war Miss Agnes

Has anyone heard of the origin of the phrase "Go to war Miss Agnes!" Chuck Thompson, Baltimore Sportscaster, would say this during broadcasts. My grandmother used to say "Go to war St. Agnes!"can't seem to find the phrase in internet searches.
Thanks.

Here are a couple of Googled links. They don't give an origin but give some chronology.

[Dead link removed - ed]