a sudden attack or brief invasion into enemy territory, especially to obtain something; a raid.
Merriam-Webster Online Dictionary
foray (verb)transitive verb
intransitive verb
archaic to ravage in search of spoils - pillage to make a raid or brief invasion - forayed into enemy territory
1.
a sudden or irregular invasion or attack for war or spoils - raid
2.
a brief excursion or attempt especially outside one's accustomed sphere - the novelist's foray into nonfiction