On January 20, 1776, the Colonel resigned in a communication to Congress setting forth that he was ill-treated by many of the officers and that nearly one-half of them threatened to resign if he continued in command. He also stated that this circumstance would not alter his conduct or abate his zeal, and whenever called upon again to serve his country, he would, with the greatest pleasure, obey the summons. Colonel Bull was succeeded by Colonel John Philip DeHaas, of Lebanon, who was commissioned two days later.
Colonel Bull served as one of the Commissioners at the important Indian treaty held at Easton, January 30, 1777; in February he was in command of the works at Billingsport.
The Supreme Executive Council created the Board of War, March 13, 1777, and named Colonel John Bull as one of the original members. They organized the following day.
On May 2, he was commissioned colonel of the State Regiment of Foot, which was organized with the residue of the battalions of Colonels Samuel Miles and Samuel J. Atlee, as a nucleus. June 2 this regiment was stationed at Fort Mercer, under command of Colonel Bull, its strength being four hundred and sixty-three.
As Colonel Bull was not an officer of either battalion, the other officers claimed his appointment ruined their rank, and as the regiment was put in the Continental service, June 10, 1777, the Supreme Executive Council appointed Colonel Bull adjutant general of the militia of Pennsylvania, and appointed Walter Stewart to the command of the regiment, which participated at Brandywine and Germantown.
He was also colonel of the Sixth Battalion of Associators, of Philadelphia, during 1777. During October of this year, Colonel Bull’s barns, barracks, grain and hay were burned by the British, and his wagons, horses, sheep and Negroes carried off, although General Howe had given his word to Mrs. Bull that they would not be disturbed.
In December, Brigadier General James Irvine was wounded and captured in the attempted surprise by the British at Whitemarsh, and Colonel Bull succeeded to the command of the Second Brigade Pennsylvania Militia, under command of General John Armstrong.
During Christmas week, 1777, the British crossed the Delaware and made a raid into New Jersey, another detachment at the same time crossed at Gray’s Ferry and took the road to Chester and Darby, with three hundred wagons. Howe and Erskine were with them; they made a demonstration towards Chester. Several pickets and detachments skirmished on their front and flank, under Captain Potterfield.
Colonel John Bull, with his brigade marched to force the foragers to retire by demonstrating against the enemy’s lines. His forces were distributed on the Frankford, Germantown and Ridge Roads, and caused the enemy to sound a general alarm. Bull planted his cannon, on Christmas Day, and fired several shots at the heart of the city, then withdrew to Frankford.
Marshall says: “Col. Bull, on the twenty-fifth instant, made an excursion into Fourth Street, Philadelphia, with two thousand militia, and alarmed the city by firing some pieces of cannon into the air, whereby some of the ball fell about Christ Church. He then made a good retreat back to his station, without the loss of a man.” The enemy, however, made no more raids.