The 9th Pennsylvania Regiment was authorized 16 September 1776 and was assigned to the main Continental Army on 27 December 1776.
It was organized during the spring of 1777 to consist of eight companies of volunteers from Westmoreland, Lancaster, Chester, Philadelphia and Cumberland counties of the commonwealth of Pennsylvania.
The regiment was assigned to the 3d Pennsylvania Brigade of the main Continental Army on 27 May 1777.
On 22 July 1778 the regiment was reassigned to the 2d Pennsylvania Brigade.
The regiment was known for wearing brown uniforms with red facings and a brimmed leather jockey cap adorned with a black feather.