Gen. Gage's instructions to them, under date of Feb. 22, 1775, called for description of the roads, rivers, and hills; available places for encampments; whether or not the churches and church yards were advantageous spots to take post in and capable of being made defensible. They were also told that information would be useful in reference to the provisions, forage, etc., that could be obtained at the several places they should pass through.

Their first trip was to Worcester, in the latter part of February, and their next one to Concord, for which place they set out on March 20, passing through Roxbury, Brookline, and Weston, where they stopped at the Jones Tavern.

Then they proceeded through Sudbury, crossed over the South Bridge into Concord village, where they were entertained by a Mr. Bliss, a friend of the royal government.

Wherever they went their mission was known in spite of their disguises. They succeeded, however, in bringing back to Gen. Gage a very tolerable description of the country, and so fulfilled their mission. In Concord, especially, they located many of the provincial military stores, information particularly useful to the invading force on April 19th.

Having thus possessed himself of sufficient data, Gen. Gage then laid his plans for a midnight march to Lexington and Concord with the view, possibly, of capturing Hancock and Adams, who were known to be at the former place, and especially of destroying all the war-like supplies that had been gathered at Concord.

April 15, the grenadiers and light infantry had been relieved from duty, with the excuse that they were to learn a new exercise. That night, about twelve o'clock, boats belonging to the transports which had been hauled up for repairs were launched and moored under the sterns of the men-o-war.[37] The Somerset was anchored near the Charlestown Ferry.[38] These movements awakened the suspicions of Dr. Warren, who lost no time in notifying Hancock and Adams, then at Lexington. On the afternoon of April 18th, he learned from several sources that the British were about to move. A gunsmith named Jasper, learned as much from a British sergeant and lost no time in informing Col. Waters of the Committee of Safety, who in turn gave the news to Warren.[39] John Ballard, connected with the stable in Milk Street, overheard some one in the Province House remark that there would "be hell to pay tomorrow;" a remark so full of significance that he reported it to a friend of liberty in Ann Street, thought to have been William Dawes, who in turn reported it to Paul Revere.[40]

That night Gen. Gage despatched ten or more sergeants, partially disguised, along the highways in Cambridge and beyond, towards Concord. They were instructed to intercept any passers-by, and so prevent his intended movement from becoming known. A party of his officers dined at Wetherby's Tavern[41] in Menotomy (now Arlington), where also met that day the Committee of Safety and Committee of Supplies, some of whom, Mr. Gerry, Col. Orne and Col. Lee, remained to pass the night.[42]

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