Plowe, as we shall see, had good reason to change his whole plan ; and that cause was, the treason of a commissioned officer of the American army. Four years before, the traitor Arnold attempted to betray West Point. A similar, but more successful traitor, betrayed Mount Washington. On the 2d of November, 1776, Adjutant ]^Iaga\v, passed undiscovered, out of Fort Washington into the British camp, convejing the plans of the fort and full information as to all its works and garrison, and placed them in the hands of Lord Percy.

On the 15th of November, the grand army of Howe, that was seen in such splendor in White Plains but a short time before, now gathered around the doomed fortress of Mt. Washington, and it soon fell by the treacherj' of a traitor whose infamy ought to be known, and his name branded vnth that contempt that traitors only deserve.

The following additional particulars respecting the engagement on Chatterton's hill are contained in Gen. Heath's Memoirs : --

27th of October, "In the foreooon, a heavy cannonade was heard towards Fort Waslimgton. Thirteen Hessians and two or tliree British soldiers tvere sent in ou this day. From tl)e American camp to the west, south-west, there appeared to be a very commanding height, worthy of attention. Tlie Commander-in-Chief ordered the general officers who were off dut\-, to attend him to reconnoitcr tliis ground, on this morning. When arrived at the ground, altliough very couimanding, it did not appear so much so, as other grounds to the north, and ulmoGt parallel with the left of the army, as it was then formed. ''Yonder," says Major Gen. Lee, pointing to the grounds just mentioned, "is tlie ground we ought to occupy." "Let us tlieu go and view it," replied the Commander-iu-Chief, When on the way, a light horseman came up on full gallop, his horse almost out of breath, and addressed General "Washington -- "The British are in the camp, sir." The General observed, "Gentlemen, ^ve have now other business than recf)nnoitring," putting his horse in full gallop for the camp, and followed by the other officers.