General Washington explicitly stood on the principles of being a regular, so much so that he would send back british letters unopened if they had not been properly addressed according to military custom.
(that custom has been codified somewhat with the Geneva Conventions, but it remains to be seen how applicable these conventions are in the twenty-first century.)
[1] hostilities having started when the brits, acting on undeniably accurate intelligence, sent out parties to destroy rural terrorist arms caches somewhere out in the boonies of Middlesex county. After accomplishing their mission despite sporadic hostile opposition, they were subject to sustained small arms fire from unlawful combatants on the return trip.
https://en.wikipedia.org/wiki/Battles_of_Lexington_and_Conco...
https://en.wikipedia.org/wiki/Battles_of_Lexington_and_Conco...
[2] Catherine, for instance, not only engaged in sanctions busting, but (at least according to russian sources) reneged on providing troops for the british which her diplomats had initially considered, leaving the public/private military contracting to various HRE relatives of George's. No fan of democracy, she, but "enemy of my enemy" reliably trumps ideologies in geopolitics. (for contrast, the CSA would discover mere economics "but muh property rights! and cheap cotton!" didn't trump a general nineteenth century distaste for slavery: https://news.ycombinator.com/item?id=24260354 )
E.g. https://en.wikipedia.org/wiki/Hesse-Hanau_Troops_in_the_Amer... provided 2'400 troops out of an estimated 30'000 germans, suggesting the coalition of the billing must've been fairly large. https://www.lagis-hessen.de/de/subjects/xbrowse/sn/hetrina might contain better information.