It did not begin as a guerrilla war, true; but the abject failure of that initial effort made it clear to Washington that the war had to continue as an irregular war without set front lines or attempts to directly take back New York or Boston. Guerrilla wars can have large battles, but do not have established, continuing and continuous front lines. Mao's troops now and then held large battles with the Japanese (and KMT), once by choice - but his armies nearly always fought as guerillas and were far more successful in that role.

Perhaps the American revolution isn't as obvious a case because the Brits tended to turtle a lot; not trying to demonstrate that they were in control of nearly the whole place and so providing a plethora of targets (unlike the Japanese, say.)