Meantime Admiral Porter, who after leaving the mortar flotilla had been appointed to the command of the Mississippi squadron, with the rank of acting rear-admiral, realized as forcibly as Farragut the importance of placing vessels in the waters between Vicksburg and Port Hudson. In the middle of December he was before Vicksburg, and had since then been actively supporting the various undertakings of the land forces. Three days after Grant joined the army, on the 2d of February, the ram Queen of the West ran the Vicksburg batteries from above, and successfully reached the river below. Ten days later, Porter sent on one of his newest ironclads, the Indianola, which made the same passage under cover of night without being even hit, although twenty minutes under fire. The latter vessel took with her two coal barges; and as the experiment had already been successfully tried of casting coal barges loose above the batteries, and trusting to the current to carry them down to the Queen of the West, the question of supplies was looked upon as settled. The Indianola was very heavily armed, and both the admiral and her commander thought her capable of meeting any force the enemy could send against her. Unfortunately, on the 14th of February, two days only after the Indianola got down, the Queen of the West was run ashore under a battery and allowed to fall alive into the hands of the enemy. The latter at once repaired the prize, and, when ready, started in pursuit of the Indianola with it and two other steamers; one of which was a ram, the other a cotton-protected boat filled with riflemen. There was also with them a tender, which does not appear to have taken part in the fight. On the night of February 24th the pursuers overtook the Indianola, and a sharp action ensued; but the strength of the current and her own unwieldiness placed the United States vessel at a disadvantage, which her superior armament did not, in the dim light, counterbalance. She was rammed six or seven times, and, being then in a sinking condition, her commander ran her on the bank and surrendered. This put an end to Porter's attempts to secure that part of the river by a detachment. The prospect, that had been fair enough when the Queen of the West was sent down, was much marred by the loss of that vessel; and the subsequent capture of the Indianola transferred so much power into the hands of the Confederates, that control could only be contested by a force which he could not then afford to risk.