The schooner being thus disposed of, the British turned their attention to the four captured transports at Fort Penn. Capt. Middleton and Capt. McLane, who commanded the American militia on shore, had taken advantage of the delay to build a battery of bales of hay near the piers. The British sloop-of-war opened the attack, but the sharp-shooters in the battery and on the transports gave her so warm a reception that she retired. She soon returned to the attack, but was checked by the American fire, and might have been beaten off, had not Middleton received a mortal wound while standing on the battery and cheering on his men. Dismayed by the fall of their leader, the Americans set fire to the transport and fled to the woods, leaving the British masters of the field. Barry's conduct in this enterprise won for him the admiration of friend and foe alike. Sir William Howe, then commander-in-chief of the British forces in America, offered the daring American twenty thousand guineas and the command of a British frigate, if he would desert the service of the United States. "Not the value and command of the whole British fleet," wrote Barry in reply, "can seduce me from the cause of my country." After this adventure, Barry and his followers made their way through the woods back to Whitehall, where his ship the "Effingham" was lying at anchor. Here he passed the winter in inactivity. At Whitehall, and near that place, were nearly a dozen armed ships, frigates, sloops, and privateers. All had fled thither for safety when the British took possession of Philadelphia, and now found themselves caught in a trap. To run the blockade of British batteries and men-of-war at Philadelphia, was impossible; and there was nothing to do but wait until the enemy should evacuate the city. But the British were in no haste to leave Philadelphia; and when they did get ready to leave, they determined to destroy the American flotilla before departing. Accordingly on the 4th of May, 1778, the water-front of the Quaker City was alive with soldiers and citizens watching the embarkation of the troops ordered against the American forces at Whitehall. On the placid bosom of the Delaware floated the schooners "Viper" and "Pembroke," the galleys "Hussar," "Cornwallis," "Ferret," and "Philadelphia," four gunboats, and eighteen flat-boats. Between this fleet and the shore, boats were busily plying, carrying off the soldiers of the light infantry, seven hundred of whom were detailed for the expedition. It was a holiday affair. The British expected little fighting; and with flags flying, and bands playing, the vessels started up stream, the cheers of the soldiers on board mingling with those on the shore.