The claim has been set up by American historians, and accepted as true by those of Great Britain, that hostilities were commenced at Lexington and by the British commander. This is not so. The first act of hostilities was the attack upon the government post of Fort William and Mary at Newcastle, in Portsmouth harbor, New Hampshire. The attack was deliberately planned by the disunion leaders, and executed by armed and disciplined forces mustered by them for that purpose.[38] The fort contained large quantities of government arms and ammunition, and being garrisoned by but a corporal's guard, it was too tempting a prize to be overlooked by Samuel Adams and his colleagues. Sir John Wentworth, governor of New Hampshire, tells us that the raiding party was openly collected by beat of drum in the streets of Portsmouth, and that, being apprised of their intent to attack a government fort, he sent the chief justice to warn them that such an act "was short of rebellion," and entreated them not to undertake it, "but all to no purpose." They embarked in three boats, sailed to the fortress and "forced an entrance in spite of Captain Cochrane, the commander, who defended it as long as he could. They then secured the captain triumphantly, gave three cheers, and hauled down the king's colors."[38] [38] Letter of Governor Wentworth, New Eng. His. Gen. Reg., 1869, page 274. Thomas Coffin Amory, in his "Military Service of General Sullivan," says (p. 295) that "the raiding force consisted of men whom Sullivan had been drilling for several months; that they captured 97 kegs of powder and a quantity of small ammunition which were used against the British at Bunker Hill." The attack on this fort is worthy of far more consideration than has been given to it, for not only did it occur prior to the conflict at Concord, but was the direct cause of that conflict. It was as much the commencement of the Revolutionary war as was the attack on Fort Sumpter by the disunionists, in 1861, the commencement of the Civil War, and had precisely the same effect in each case. When the news reached London that a government fort had been stormed by an organized force, its garrison made prisoners and the flag of the empire torn down, the ministers seem to have become convinced that it was the determination of the colonists to make war upon the government. To tolerate such a proceeding would be a confession that all law and authority was at an end. Some vindication of that authority must be attempted. An order was dispatched to General Gage to retake the munitions that had been seized by the disunion forces, and any other found stored that might be used for attacking the government troops; surely a very mild measure of reprisal. It was in obedience to this order that the expedition was dispatched to Concord, that brought about the collision between the British and colonial troops and the so-called "Battle of Lexingon."