I have now "Upidee" as it was published in 1859 in "College Songs," compiled by C. Wistar Stevens. "Upidee" (pp. 20-21) is reproduced there with the permission of O. Ditson & Co., who published the sheet music (also 1859) linked by Masato, above.
Gwillim is correct- it should be sheath after faulchion. He also is correct about the Tra-la-la-la-la after the line 'As through an Alpine village passed,'.
'Sheaf' is an error in "Heart Songs," from which I copied the lyrics. The 'Tra-la---'error is mine.

In "College Songs," a note precedes the music and lyrics. "The solos usually sung at Harvard to this music are College songs which contain so many local names and allusions as to render them uninteresting to all but Harvard Students. Some familiar verses from Longfellow's Excelsior are therefore inserted for the solo parts of the song."