He was made Postmaster-General of the united colonies, and prepared a plan for a line of posts from Maine to Georgia. He dropped all his conservatism and became very earnest for the war, but was humorous and easy-going about everything. He had, of course, the privilege of franking his own letters; but instead of the usual form, “Free. B. Franklin,” he would mark them “B free Franklin.” He prepared a plan or constitution for the union of the colonies, which will be considered hereafter. Besides his work in Congress, he was soon made a member of the Pennsylvania Legislature, and was on the Committee of Safety which was preparing the defences of the province, and was, in effect, the executive government in place of the proprietary governor. From six to nine in the morning he was with this committee, and from nine till four in the afternoon he attended the session of Congress. He assisted in devising plans for obstructing the channel of the Delaware River, and the _chevaux-de-frise_, as they were called, which were placed in the water were largely of his design. It was extremely difficult for the Congress to obtain gunpowder for the army. The colonists had always relied on Europe for their supply, and were unaccustomed to manufacturing it. Franklin suggested that they should return to the use of bows and arrows: “These were good weapons not wisely laid aside: 1st. Because a man may shoot as truly with a bow as with a common musket. 2dly. He can discharge four arrows in the time of charging and discharging one bullet. 3dly. His object is not taken from his view by the smoke of his own side. 4thly. A flight of arrows seen coming upon them, terrifies and disturbs the enemies’ attention to their business. 5thly. An arrow striking any part of a man puts him _hors de combat_ till it is extracted. 6thly. Bows and arrows are more easily provided everywhere than muskets and ammunition.” This suggestion seems less strange when we remember that the musket of that time was a smooth-bore and comparatively harmless at three hundred yards. [Illustration: FRANKLIN’S LETTER TO STRAHAN] His letters to his old friends in England were full of resentment against the atrocities of the British fleet and army, especially the burning of the town of Portland, Maine. It was at this time that he wrote his famous letter to his old London friend, Mr. Strahan, a reproduction of which, taken from the copy at the State Department, Washington, is given in this volume. It is a most curiously worded, half-humorous letter, and the most popular one he ever wrote. It has been reprinted again and again, and _fac-similes_ of it have appeared for a hundred years, some of them in school-books.