The "Merrimac," after being repaired and altered to some extent, sailed down the bay on the 11th of April, for the purpose, as her officers said, of meeting the "Monitor" again. She steamed into the Roads, and exchanged a few shots with the Union batteries at the rip-raps; but the "Monitor," and other Union vessels, remained below Fortress Monroe, in Chesapeake Bay, out of the reach of the Confederate vessel. Again, a few days later, the "Merrimac" went to Hampton Roads, and tried to lure the "Monitor" to battle; but again the challenge passed unanswered. It is probable that the Federal naval authorities did not care to imperil the only vessel that stood between them and destruction, out of mere bravado. Had the "Monitor" come out, an attempt would have been made to carry her by boarding. The crew of the "Merrimac" were prepared for the attack; and four gunboats accompanying her were crowded with men, divided into squads, each with its specified duty. Some were to try and wedge the turret, some were to cover the pilot-house and all the openings with tarpaulin, others were to try to throw shells and gunpowder down the smokestack. But all these preparations proved useless, as the "Monitor" still remained quietly at her anchorage. On May 8 a third trip was made by the "Merrimac." When she came down the bay, she found the Union fleet, including the "Monitor," hard at work shelling the Confederate batteries at Sewall's Point. As she came towards them, they ceased their cannonade, and retired again to the shelter of Fortress Monroe. The "Merrimac" steamed up and down the Roads for some hours; and finally Commodore Tatnall, in deep disgust, gave the order, "Mr. Jones, fire a gun to windward, and take the ship back to her buoy."