THE FIREMAN COWBOY   aka  THE TRUSTY LARIAT , has the stanza,

Oh we will all remember
That forty-fifth of May
For there were many gallant hearts
All filled with fear that day

That's not a typo – the lyrics really do refer to the 45th of May, intentionally. The full lyrics are at /mudcat.org/@displaysong.cfm?SongID=1368 with a discussion at /mudcat.org/thread.cfm?threadid=15451 and Youtube links https://www.youtube.com/watch?v=YBhSR9Mxoj4 (Faith Petric)
and https://www.youtube.com/watch?v=unmWIfSHN5c (Mac McClintlock).

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More recordings on Youtbe     https://www.youtube.com/results?search_query=++THE+FIREMAN+COWBOY++
MUDCAT Digitrad Lyrics: COWBOY FIREMAN (TRUSTY LARIAT) (Harry A. McClintock)    @displaysong.cfm?SongID=1368