Concealed geography 15

Original title: Concealed geography 48

Puzzle

After singing a "te deum", bag, O soldier, your booty.

Hints

Hint 1
A lake

Hint 2
in the USA

Hint 3
in New Hampshire

Hint 4
last letter added in modern name

Loyd, Sam [1914]. in Loyd, Sam, Jr.: Sam Loyd's Cyclopedia of 5000 Puzzles Tricks and Conundrums (in English). New York: Lamb Publishing company, page 10.