[Robert Bolton, Jr. (1848)] Emmerick with his corps marching north to Boar hill; then crossing over the hills east, Lincoln followed ihe course of Tippett's brook, for the purpose of avoiding Pruschank's corps, stationed upon Cortlandl's ridge. Passing the Van Cortlandt residence, he kept close to the edge of Gun and Locust hills, and had arrived in the vicinity of General Montgomery's house, (then occupied by his widow,) unobserved by the sentinels on the opposite side, when the enemy's patrol fired. De Lancey, instantly on the alert, commenced his retreat in face of General Lincoln's advancing columns. Totten, De Lancey's lieutenant, seemed determined to make a stand, but soon received positive orders from De Lancey to retire, which he did, just in time to avoid the surprisal. Colonel Armand, the celebrated Frencli cavalry officer, made a daring and successful attempt to surprise a large piquet of Green Yagers, stationed at Warner's store, under the command of De Wurmb. For this purpose Armand left his quarters above the Croton and proceeded down the main post road to the village of Yonkers; after passing the village, and when in the neighbor-hood of the enemy's encampment, he started his whole corps on a full gallop. The Yagers had taken the precaution to post a sentinel at Hadley's spring, but the poor fellow became so per-fectly alarmed and powerless on seeing the furious onset of Armand's horse, that he could give no alarm, and was instantly dispatched.