R. Grey (in the absence of both the commander and executive officer) assumed command of the ship. Within three minutes, her gunners had all of the .50-caliber Browning machine guns ready for action while the ship prepared to get underway. Inside the nest, however, the high-speed minesweeper could only bring her aftermost machine guns to bear against the approaching planes. Shortly after 0900, about midway through horizontal bomber attacks (carried out by Nakajima B5N bombers), Aichi D3A's (later code-named "Vals") began glide- and dive-bombing attacks on the ships and shore installations, kicking off the fourth phase of the raid. Those planes, coming from a westerly direction, were targets for the eager gunners in the minesweepers and minelayers moored in Middle Loch. Wasmuths gunners (who expended 6,000 rounds of .50-caliber ammunition in the action) opened fire whenever the planes came within range. One man, Seaman 1st Class James P. Hannon, was given credit for shooting down an Aichi that crashed in a portion of Pearl Harbor on Waipio Peninsula, near Middle Loch just North of Mamala Bay in South Central Oahu. The ship damaged several other planes as they came by. Lt Cmdr. L. M. LeHardy (Zanes commanding officer and the senior officer present of MineDiv 4) ordered the ships to get underway, Trever leading the pack at 0932. Five minutes later, Lt. J. W. Leverton, Wasmuths executive officer, arrived as his ship edged out of Middle Loch, and took command, relieving Lt. (jg.) Grey who had fought the ship since the outset of the attack. Shortly thereafter, Trevers commander reported on board too, since his own ship was steaming down the channel without him. Proceeding out of her harbor herself soon thereafter, Wasmuth took up patrols off the channel entrance. Meanwhile, while the attack itself had ceased, jittery sailors, marines, and soldiers were not so sure. At sea, the forces searching for the retiring Japanese suspected the presence of enemy submarines, real or otherwise. At 1023, Wasmuth dropped one depth charge "on suspicious water" but came up with only a negative result. At 1036, the high-speed minesweeper dropped another depth charge, but only achieved the same result as the first attack - nothing. Although it brought up "large quantities of oil" there was no wreckage. Later that afternoon, Wasmuth and Zane swept the Pearl Harbor entrance channel before the former anchored at the coal docks when her sweep wire parted.