FROM THE COMMITTEE OF FOREIGN AFFAIRS TO THE COMMISSIONERS. Philadelphia, June 18th, 1777. Gentlemen, In this we send you an account of the most material matters, which have happened in the military department. The enemy, about ten weeks ago, sent a large party, and destroyed some continental stores at Peekskill, the value not great, and retreated immediately after. They afterwards made an attempt to surprise Major General Lincoln, at Bound Brook, which he vigilantly escaped, with the loss of about sixty men. Mr Tryon, who is made a Major General, was sent with about 2200 men to destroy the stores at Danbury, in Connecticut. Notice was received time enough to remove the most valuable part, while Generals Arnold and Wooster raised the militia, and attacked the enemy on their retreat with good success. The New York paper, which may be considered as General Howe's Gazette, makes their loss in killed and wounded 104. We may give them credit for twice the number. The loss we sustained in stores was chiefly in salt provisions and rum, and we had the satisfaction of learning, that the cargoes of the prizes brought in the same week amounted to double the quantity lost. General Wooster, who behaved gallantly, was mortally wounded, and is since dead. Scarce a week has passed without skirmishing, in which we have been very fortunate. General Washington has removed from Morristown, to some advantageous ground near Bound Brook and Middle Brook, within eight miles of Brunswick, and the following is a regular state of the intelligence received here since the 11th inst. _June 11th._--At a meeting in the State House yard, General Mifflin, despatched for that purpose from General Washington, informed the inhabitants, that from the late preparations of the enemy, he had reason to believe their design was, by a forced march, to endeavor to possess themselves of Philadelphia; it was then proposed and unanimously assented to, to turn out agreeably to the militia law. _12th._--A letter from General Sullivan, at Princeton, received about nine this evening, informed that the enemy at Brunswick had begun to move the preceding night, but was prevented by the heavy rain. _13th._--The alarm gun in this city fired at three this morning, answering the alarm guns up the river. Several letters, by express from Bristol, mention the hearing alarm guns towards Trenton and Princeton, but that no express has arrived there from General Sullivan at Princeton. _14th._--An express from General Arnold, at Trenton, informed that the enemy had moved on the 13th, in the night from Brunswick, that General Sullivan had likewise moved from Princeton to some part of Rocky Hill, with an intention to harrass the march of the enemy, and thereby favor the approach of General Washington on their rear, and that of the troops from Philadelphia.