The passage of the Carondelet was not only one of the most daring and dramatic events of the war; it was also the death-blow to the Confederate defence of this position. The concluding events followed in rapid succession. Having passed the island, as related, on the night of the 4th, the Carondelet on the 6th made a reconnoissance down the river as far as Tiptonville, with General Granger on board, exchanging shots with the Confederate batteries, at one of which a landing was made and the guns spiked. That night the Pittsburg also passed the island, and at 6.30 A.M. of the 7th the Carondelet got under way, in concert with Pope's operations, went down the river, followed after an interval by the Pittsburg, and engaged the enemy's batteries, beginning with the lowest. This was silenced in three-quarters of an hour, and the others made little resistance. The Carondelet then signalled her success to the general and returned to cover the crossing of the army, which began at once. The enemy evacuated their works, pushing down toward Tiptonville, but there were actually no means for them to escape, caught between the swamps and the river. Seven thousand men laid down their arms, three of whom were general officers. At ten o'clock that evening the island and garrison surrendered to the navy, just three days to an hour after the Carondelet started on her hazardous voyage. How much of this result was due to the Carondelet and Pittsburg may be measured by Pope's words to the flag-officer: "The lives of thousands of men and the success of our operations hang upon your decision; with two gunboats all is safe, with one it is uncertain."