bushwhacker

Short definition from Wiktionary

Noun

1. 1
   One who travels through the woods, off the designated path.
2. 2
   A person who lives in the bush, especially as a fugitive; a person who clears woods and bush country.
3. 3
   A guerrilla (of either side) during the American Civil War.
4. 4
   Someone who attacks without warning.
5. 5
   A small, soft-floored inflatable boat (designed for use by one or two people).