Before the war the Atlantic and Gulf waters of the United States, with those of the West Indies, Mexico, and Central America, were the cruising ground of one division of vessels, known as the Home Squadron. At the beginning of hostilities this squadron was under the command of Flag-Officer G.J. Pendergrast, who rendered essential and active service during the exciting and confused events which immediately followed the bombardment of Fort Sumter. The command was too extensive to be administered by any one man, when it became from end to end the scene of active war, so it was soon divided into three parts. The West India Squadron, having in its charge United States interests in Mexico and Central America as well as in the islands, remained under the care of Flag-Officer Pendergrast. Flag-Officer Stringham assumed command of the Atlantic Squadron, extending as far south as Cape Florida; and the Gulf, from Cape Florida to the Rio Grande, was assigned to Flag-Officer William Mervine, who reached his station on the 8th of June, 1861. On the 4th of July the squadron consisted of twenty-one vessels, carrying two hundred and eighty-two guns, and manned by three thousand five hundred men. Flag-Officer Mervine was relieved in the latter part of September. The blockade was maintained as well as the number and character of the vessels permitted, but no fighting of any consequence took place. A dashing cutting-out expedition from the flag-ship Colorado, under Lieutenant J.H. Russell, assisted by Lieutenants Sproston and Blake, with subordinate officers and seamen, amounting in all to four boats and one hundred men, seized and destroyed an armed schooner lying alongside the wharf of the Pensacola Navy Yard, under the protection of a battery. The service was gallantly carried out; the schooner's crew, after a desperate resistance, were driven on shore, whence, with the guard, they resumed their fire on the assailants. The affair cost the flag-ship three men killed and nine wounded.