Operations in the Mississippi having now temporarily ceased, Farragut was at liberty to give his undivided attention for a time to the coast blockade. The important harbor of Pensacola had been evacuated by the Confederates in May, less than a month after the capture of New Orleans. Its abandonment was due to want of troops to garrison it properly; the pressure of the United States armies in Kentucky and Tennessee, after the fall of Fort Donelson in the previous February, having necessitated the withdrawal of all men that could be spared from other points. Before the war Pensacola had been the seat of a well-equipped navy yard with a good dry-dock, the only naval station of the United States in the Gulf of Mexico. At the time of the evacuation the buildings in the yard had been destroyed and the dry-dock injured; but the fine harbor, the depth of water--twenty-two feet--that could be carried over the bar, and the nearness of the port to Mobile, the most important center of blockade running, all combined to make it the headquarters of the fleet for repairs and supplies. Farragut arrived there on the 20th of August. Just before leaving New Orleans he received his commission as rear admiral, dated July 16, 1862. Three other officers were promoted at the same time to the active list of this grade, which had never before existed in the United States; but as Farragut was the senior in rank of the four, he may be said to have been the first officer of the navy to hoist an admiral's flag. The admiral remained in Pensacola for three months, superintending from there the affairs of his squadron. During this period the harbors of Galveston and of various other smaller ports on the coast of Texas and Louisiana were occupied by detachments of vessels, as the surest way of enforcing the blockade. The admiral had early announced that he should carry on the blockade as far as possible inside; and these successes enabled him to say in December, 1862, that he now held the whole coast except Mobile. During his stay in Pensacola he received a visit from his son, who found him in the best of spirits, all having gone well on the coast; the only mishap having been the success of a Confederate cruiser, the Oreto, in running into Mobile. She had availed herself of her close resemblance to some of the British cruisers in the Gulf to hoist the British flag; and as visits of these vessels to the blockaded ports were authorized and not infrequent, the ruse induced the United States ship that overhauled her to withhold its fire for a few critical moments. During these the Oreto gained so far on the other that, although struck three times by heavy projectiles, she received no vital injury and succeeded in gaining the shelter of the forts.