Washington established a policy of promotion based on merit rather than family connections or purchased advancement as was frequently the case in the British army.
"As there are several Vacancies in the different Regiments, if there are any particular Gentlemen, who signalized themselves in the Action on Bunkers hill, by their spirited behaviour and good conduct, and of which, sufficient proof is adduced to the General; He will, in filling up the Commissions, use his endeavours to have them appointed (if not already Commission’d) to some Office, or promoted if they are; as it will give him infinite pleasure at all times to reward Merit, wherever it is to be found."
George Washington, General Orders, 9 August 1775founders.archives.gov
https://history.army.mil/Publications/Publications-Catalog/The-Canadian-Campaign/