Meanwhile Admiral Wilkes was cruising off the westerly end of Cuba, thinking the Alabama would probably be there, trying to intercept the homeward bound California steamer. Doubtless she would have been there, had it not seemed to her commander that a more important duty called him to the gulf. Admiral Wilkes reasoned that the Agrippina could never have reached an easterly port against the heavy gale, and decided to look into the harbor of Mugeres Island in the narrowest part of Yucatan Channel, in the hope of finding her. Here he discovered a vessel which was at first thought to be the Alabama, but which proved to be the Virginia, formerly the Noe-Daquy, which was being fitted up to run the blockade. A Mexican officer had seized her, on the ground that she was engaged in the slave trade, and was not disposed to permit her being sent before a prize court at Key West. The complications arising in the case of this vessel kept Admiral Wilkes at Mugeres Island until January 18th, except that he made one trip to Havana for coal. Two days' sail to the westward would have brought him to the Arcas Keys, but he had no means of knowing that the Alabama had passed into the gulf.
On the 5th of January, 1863, the Alabama left the Arcas Keys for her cruise to the northward. Full descriptions of the Banks expedition and its destination had appeared in the northern newspapers, and Captain Semmes was well supplied with information as to the character of the transport fleet and the time when it might be expected to arrive off Galveston. It was not likely that the transports would be accompanied by a great number of war vessels, as the Confederacy had no fleet in the gulf, and the northern papers had reported the Alabama as well on her way to the coast of Brazil. As there was only twelve feet of water on the bar, most of the transports would be obliged to anchor outside. A night attack--a quick dash--firebrands flung from deck to deck--and the fleet might be half destroyed before the gunboats could get up steam to pursue.
Semmes determined to run in by daylight far enough to get the bearings of the fleet, and then draw off and wait for darkness. He had permitted enough of his plan to leak through the ward room to the forecastle to put his people on their mettle, and the entire crew were eager for the fray. On January 11th the man at the masthead was instructed to keep a lookout for a large fleet anchored near a lighthouse. His "sail ho! land ho!" came almost simultaneously, and the captain began to feel certain of his game. But later questioning brought the answer that there was no fleet of transports--only five steamers, which looked like vessels of war. Soon after a shell thrown by one of the steamers was distinctly seen to burst over the city. It could not be that the Federals would be firing upon a city which was in their own possession, and Semmes immediately came to the correct conclusion that Galveston had been recaptured by the Confederates. That the Banks expedition had been diverted to New Orleans, and would proceed toward Texas by way of the Red River he could not know, but that it had not reached Galveston was sufficiently apparent.