The plan was to fit up as a fire-ship, or "infernal," the ketch Intrepid, in which Decatur had won immortality in the same harbor, take it in, and explode it among the Tripolitan fleet. Somers earnestly begged Commodore Preble for the honor of leading this desperate expedition, and the commodore at last agreed. It would be necessary to pour one hundred barrels of gunpowder into the hold of the ketch in order to make it effective as a fire-ship, and before consenting to this, the Commodore warned Somers that so much powder must not be allowed to fall into the hands of the Tripolitans. It was during the Napoleonic wars, powder was in great demand, and the Tripolitans were supposed to be short of it. After this interview Somers expressed the determination to be blown up rather than to be captured. The details of the attack were worked out most carefully. Besides the powder, the Intrepid was to carry a large stock of splintered wood; and about two hundred shells, with their fuses prepared, were laid on her decks, to add their horrors to the explosion. The brave adventurers had two chances for their lives, in having two boats in which to escape from the ketch. One of them was a very fast four-oared boat from Somers's own vessel, the Nautilus, and the other was a six-oared cutter from the Constitution. Somers was to be in his own boat, while Lieutenant Henry Wadsworth[16] commanded the Constitution's cutter. Ten sailors were to be taken along, making twelve persons in all; but the number was increased to thirteen by a little midshipman, Joseph Israel, who smuggled himself into the Constitution's boat. Somers had consulted at every step his bosom friend Decatur, and Charles Stewart, with whom he had begun his naval life in "Old Wagoner." Decatur, in his own vessel, the Argus, and Lieutenant-Commandant Smith, of the Vixen, and Somers's vessel, the Nautilus, under the command of his first lieutenant, Washington Reed, were to support the dauntless party in the boats as far as possible. Everything being ready, on the day after the desperate boat attack of the 3d of September, in the afternoon, Somers appeared on the deck of his vessel, and, having the crew piped up, addressed them, telling frankly the hazardous nature of the attempt he was to make, and calling for four volunteers who would go with him to advance one step ahead of the line. For answer, every man and boy on the Nautilus advanced two steps. This brave spirit was deeply gratifying to Somers, and he was forced to make a selection. He chose four of his best seamen,--James Simms, Thomas Tompline, James Harris, and William Keith.