Enter someone else's territory and take spoils(verb)
WordNet. Princeton University. 2010.
Use "foray into" in a sentence
"Debriefing with the renegade squadron of F-86Fs, something that was customary for a pilot to do after joining up with another formation, Buzz never told anyone else about the foray into Manchuria."
"The town-hall-style forum is only the latest foray into social media from a White House that has long cultivated a presence on Twitter, Facebook and YouTube."
"This severe assessment may have derived in part from the censorious influence of Henry Laurens, who hosted Washington on this foray into the capital."