The Battle of Crooked Billet
The clash occurred on May 1,1778, during the British occupation of Philadelphia. The militia, commanded by General John Lacey and assigned to cut off British supplies, was encamped here. Surprised by British troops, they were defeated and driven off with heavy losses.

Below are photos taken on May 17th, 2003 during the Craven Hall Historical Society 225TH ANNIVERSARY CELEBRATION of the BATTLE OF CROOKED BILLET @ the new park site at the former NAWC. Warminster Amateur Radio Club helped out with traffic control and communications.
   
On Thursday night last, a small party of the British infantry, dragoons, and Queen’s rangers, with a few of Capt. HOVEDEN’s Pennsylvania, and Capt. JAMES’s Chester dragoons, left the city about eleven o’clock, and proceeded up the Old York road.
   
About a mile beyond the Billet they fell in with Lacey’s brigade of militia, consisting of about 500 men, and immediately attacked them: Lacey, at first, made some appearance of opposition, but, in a few seconds, was thrown into confusion, obliged to retreat with precipitation, and were pursued about four miles.
   
They left between eighty and a hundred dead on the field; and on Friday, between fifty and sixty prisoners, besides waggoners, with ten of their waggons loaded with baggage, flour, salt, whiskey, &c. were brought in by the troops on their return: What number of rebels were wounded, we have not been able to learn.
   
Besides the above waggons, three were burnt after taking out the horses; also all the huts and what baggage could not be brought off.
   
The royal party did not lose a single man on this occasion, and have only seven men wounded, and two horses killed.
   

From the:

Royal Pennsylvania Gazette, (Philadelphia), May 5, 1778.