The reverses of the American Army during the summer and fall of 1776 culminated in its withdrawal into New Jersey, hotly pursued by the British troops. Pennsylvania was threatened and especially Philadelphia, where Congress was sitting. At this dark hour Mifflin was sent with dispatches from Washington to Congress, calling on that body loudly for help. Mifflin, at the request of Congress, made a stirring address, setting forth the perilous situation, and appealing for the means to oppose the further advance of the defiant enemy. That body was greatly exercised and ordered that General Mifflin should remain near Congress for consultation and advice. As the enemy pressed toward Philadelphia, General Putnam was sent to take command in the city and General Mifflin was placed in charge of the war material and stores. The victory at Trenton produced a gleam of hope and Congress dispatched Mifflin throughout the State of Pennsylvania in order that, by his personal appeals, volunteers might be drawn to the support of Washington’s decimated ranks. He caused large numbers to enlist. Mifflin was mixed up in the “Conway Cabal,” but in after years he explained his position, and it would seem to prove the intensity of his devotion to the struggle in which he had staked fortune and life itself. In 1783 General Mifflin was elected a member of Congress, and had the satisfaction of being President of that body, when General Washington, December 23, 1783, resigned his commission into its hands. Mifflin made an eloquent reply. General Mifflin was a member of the Assembly of Pennsylvania which met in 1785; also of the convention which sat in 1787 and framed the Constitution of the United States. In 1788 he was chosen a member of the Supreme Executive Council, and upon the retirement of Franklin, he was elected President. General Mifflin was the president of the convention that framed the State Constitution of 1790, and he and General Arthur St. Clair were the two candidates for Governor. Mifflin triumphed and was continued in office for that and the two succeeding terms. Governor Mifflin was very efficient in quelling the Whisky Insurrection of 1794, and personally commanded the troops from Pennsylvania. His last official communication as Governor was made December 7, 1799. It contained his farewell sentiments on taking leave of office and was received with every manifestation of respect by the Assembly. He was elected to the Assembly and took his seat, but did not long survive. He died during a session of the House, then sitting in Lancaster, on January 21, 1800. His decease was noticed with becoming ceremonies, resolutions being adopted expressive of the high sense entertained for him as a soldier and statesman, authorizing his interment at the public expense and providing for the erection of a monument to his memory.