Answer:
It means "the long carbine" or "the long rifle".
Step-by-step explanation:
James Fenimore Cooper's "The Last of the Mohicans" is a historical story about the Mohicans, especially the Iroquois Indians, and the battles they fought to try to keep their freedom. The story has also been adapted into a movie, directed by Michael Mann.
Hawkeye is the story's main hero, real name Natty Bumppo. He would help scout the land, and he is familiar with the land and its areas. Though affiliated and helped out the Indians more, he is a culturally mixed individual. And he carries a rifle named "Killdeer" which gave him the nickname "La Longue Carabine" which roughly translates to "The Long Carbine".