At beginning of the Revolutionary War it is said that the first military company from Pennsylvania that arrived at Washington’s headquarters, siege of Boston, in 1775, shortly after Battle of Bunker Hill, were from York County; this company, and one commanded by Captain Morgan of Virginia, were first American troops to use rifles; they became the terror of the British regulars, who still used the old-time flint musket. When the British attacked New York City and the Battle of Long Island followed, Pennsylvania troops camped at Perth Amboy; here two regiments from York County were formed out of the militia; and became a part of the Flying Camp, a body of ten thousand men from Pennsylvania, Virginia, and Maryland, which joined Washington before the Battle of White Plains; they were also in the battles of Princeton and Trenton. Colonel Thomas Hartley, a member of York County bar, commanded a brigade under Washington at battles of Brandywine and Germantown; and after the Revolution he represented York County in Congress for twelve years; he was first member of the Pennsylvania bar to be admitted to the Supreme Court of the United States. President Washington was entertained in his house in 1791, site marked by tablet. Shortly before the Battle of Brandywine, September 27, 1777, the Continental Congress adjourned from Independence Hall to meet in Lancaster; they were there one day, then crossed the Susquehanna and made YORKTOWN the seat of government until June 27, 1778, when they returned to Philadelphia. Twenty-five Congressmen came on horseback over the old Monocacy Road, and took up quarters in the town and vicinity. The personnel of Congress was constantly changing; no less than sixty-four different members were present from first to last. The mansion, corner of Center Square, where the Colonial Hotel now stands, had been rented to General Roberdeau; quarters were found there for the leading Congressmen, Adams, Lee, Harrison, Laurens, and others. John Adams, in letters to his wife Abigail, complained of his straitened quarters, and the Dutch cooking. James Smith, a signer of the Declaration of Independence, gave his law office in Center Square to be used by the Committee of Foreign Affairs; and the Board of War.