During the summer of 1847, the men of the squadron operating in the Gulf suffered severely from yellow fever and also from scurvy brought on by a lack of fresh food. It was so bad on the "Mississippi" that she had to been sent to Pensacola. Commodore Perry was himself stricken, but he refused to leave, and changed his flag to the "Germantown," which remained. This was after the fall of Vera Cruz, and when the duty of the naval forces was once again only that of blockaders. The investment of Vera Cruz was the most considerable single piece of work performed by the navy during the war. Commodore Conner had gathered at Vera Cruz all his available forces and anxiously awaited the coming of General Scott and his army, who were at Lobos Island, 150 miles north of Vera Cruz. General Taylor, with 5,000 men, had just defeated Santa Anna with 20,000 men at Buena Vista, and two days later, that is, on the 24th of February, 1847, General Scott gave his final orders to his fleet of transports which was to take his army to Vera Cruz. Early in March the transports with 12,600 men arrived in front of Vera Cruz. Captain Parker, in his book previously quoted, says: "No words can express our excitement as ship after ship crowded with enthusiastic soldiers successively came in; some anchoring near us and others continuing on for the anchorage at Anton Lizardo. We had been so long on our ships, and for some months so inactive, that we were longing for something to do. I cannot answer for others, but the scene of that day--and I recollect that it was Sunday--is so vivid, and the events so firmly fixed in my memory, that I can almost see the ship "Diadem" as she grazed our spanker-boom in her desire to pass near enough to speak us, and I can to this day whistle the waltz played by an infantry band on board a transport anchored near us that night, though I have never heard it since." Indeed, the naval contingent was most anxious to be in some of the heavy fighting, and the chance seeming near, all was enthusiasm aboard the ships of the squadron. A few days after General Scott's arrival he and Commodore Conner and a large number of principal officers, including Captain Joseph E. Johnston, of the "Engineers," made a reconnaissance to decide on the best place to land the army. They selected the mainland abreast of Sacrificios Island.