But there was more serious work immediately in store for the navy than fetching and carrying for the army and rewarding themselves in boyish pranks. The day before the serious bombardment began the squadron was notified by signal from the flagship: "Commodore Perry commands the squadron." There was rejoicing at this, for Perry was regarded as a man who preferred a fight for its own sake rather than to have no fight at all. In this command he proved that he was a good fighter, but he proved also that he knew how to be conservative when necessity made such a course wise. Commodore Conner went home because his health demanded that he should. The Navy Department was not dissatisfied with him. But the opportunity for heavy fighting came after Perry took the command. From the beginning of the siege the fleet kept up a heavy firing on the city and castle so as to divert the fire from the land forces. General Scott soon saw that his guns were not strong enough to batter down the walls of the city, so he requested Commodore Perry to send him some heavy guns. The Commodore's gallant reply was: "Certainly, General, but I must fight them." And fight them he did, as we shall see. Six heavy pieces of ordnance were landed, and about 200 seamen and volunteers were attached to each gun. Three of these were sixty-eight-pounder shell guns and three thirty-two-pounder solid-shot guns. Each of these guns weighed about three tons. Now each of these had to be dragged through the loose sand, almost knee-deep, for something like three miles before it could be put in the position the engineers had assigned to it. This battery, by the way, was protected by bags of sand piled on each other, and this was the first time that this device had been used. When the battery was in position the officers and men of the ships were so anxious to fight it that, to prevent jealousy, the officers first to be assigned drew lots for the honor. The first day Captain Aulick commanded, and the next day Captain Mayo. The naval battery fired with such precision that they did amazing damage to the enemy's works, and on the second day the guns in Vera Cruz were silenced. Then began a parley as to terms, but on the 28th there was an unconditional surrender. Now Scott had a foothold in the part of Mexico which counted for something, and he was able to begin that masterly march through the Valley of Mexico and on to the capital of the country. But he never could have obtained this foothold without the assistance of the navy. The country did not recognize this at once, and the newspapers being printed by landsmen, all of the immediate glory was bestowed on General Scott.