Incursion or foray (4)
I believe the answer is:
raid
I believe this is a double definition.
'incursion' is the first definition.
(raid is a kind of incursion)
'foray' is the second definition.
(synonyms)
(Other definitions for raid that I've seen before include "A sudden military attack and withdrawal" , "Smash-and-grab?" , "bust" , "Surprise police visit" , "Sally" .)