On June 29, just before departure on the second excursion, the minelayers _Shawmut_, Captain W. T. Cluverius, _Aroostook_, Commander J. H. Tomb, and _Saranac_, Commander Sinclair Gannon, and the repair ship _Black Hawk_, Captain R. C. Bulmer, had arrived from the United States. Uncompleted work had not delayed them like the others, but the trial runs of the _Shawmut_ and _Aroostook_ showed their fuel consumption to be much larger than had been estimated—no data having been available when their conversion was planned—making their fuel capacity insufficient for the passage over. Indefinite delay, until a tanker could accompany them, was averted by the captains hunting up enough oil hose to fuel the ships at sea. Their departure on June 16 took place during the German submarines’ activity on the New England coast—not a favorable condition for ships just out of a navy yard. Twice during the crossing, the _Black Hawk_ took the _Shawmut_ and _Aroostook_ in tow, to give them fuel oil. Though a new operation to all hands—likewise new ships, new crews, half a gale of wind, and oil hose twice as heavy as proper—it was done well, without mishap, and all four arrived at our bases ready for service. The third excursion could therefore be made by the full squadron of ten. It was to continue the first minefield, and as some of our mark buoys were known to have broken adrift—we had passed two on the second excursion—the flagship’s navigator, Lieut. Commander Cunningham, was sent out in the squadron tugs _Patuxent_ and _Patapsco_, to verify what might remain of the buoyfield. Finding half the buoys in place, he planted two new ones as a precaution. Then he passed along both our minefields, listening for further explosions, but heard none. The necessary improvement in the buoy moorings was now made, so effectively that they could be counted on thereafter. Each ship carried four buoys on her quarters, ready to drop on the instant. One stroke of an axe, or pull on a slip would release a buoy and its 1000-lb. sinker together, the mooring wire cable being so looped up around the buoy as to pay out clear. Thus the ship had no need to reduce speed nor any fear of getting her screw foul of the buoy. Embarking mines for the third excursion had already begun when a message came that no mines were to be placed west of zero longitude for the present, a restriction that shortened the intended line by 30 miles, quite upsetting the embarking arrangements then in progress.