When war was declared in June, 1812, Barney began fitting out the schooner _Rossie_ at Baltimore; on July 12th he sailed away, and from the time he cleared the capes of the Chesapeake he had such lively times as must have reminded him forcibly of revolutionary days. On July 22d he captured the American brig _Nymph_, that was violating the non-importation act. The next day he successfully dodged a British frigate that fired twenty-five shots at him. On July 30th he escaped another British frigate by superior sailing. On July 31st he captured the British ship _Princess Royal_, and burned her. Next day the ship _Kitty_ became his prize, and was found worth sending in. The day after this, August 2d, he captured four different vessels--the schooner _Squid_, the brigs _Fame_, _Devonshire_, and _Two Brothers_. On the last of these he placed sixty of his prisoners, and sent her as a cartel to St. John, New Brunswick, but while still sailing along in company with the _Two Brothers_, on August 3d, he fell in with and captured the brigs _Henry_ and _William_ and the schooners _Racehorse_ and _Halifax_, and so added forty more prisoners to those on the _Two Brothers_. The brig _Henry_ and the two schooners were sunk as not worth sending to port, while the _William_ was sent to port. He had taken eight vessels in two days. With the cartel _Two Brothers_, that he sent to St. John, he despatched a letter to Admiral Sawyer, commanding the Halifax Station, in which he asked the admiral “to treat the prisoners well, and assured him very coolly that he should soon send him another ship-load of captives for exchange.” Six days later (August 9th) he had a brush with the British ship _Jenny_, of twelve guns, but she soon surrendered to his superior force. Then he captured two more American ships that were violating the non-importation law, and after forty-five days from the day he left Baltimore he anchored at Newport, Rhode Island. He had captured fourteen vessels, aggregating 2,914 tons in measurement, and one hundred and sixty-six prisoners, the whole value of prizes and cargoes being $1,289,000. Five only of the prizes were sent to port. After resting in port until September 7th the Commodore sailed again. On the 9th a British squadron of three ships vainly tried to overhaul him, and on the 12th a British frigate chased him for six hours, and then gave it up. On the 16th the _Rossie_ fell in with the British ship _Princess Amelia_, an armed trader, and for an hour there was a steady combat. The _Rossie_ was badly cut up in sails and rigging, but her hull and spars escaped. She had seven men hurt--one severely. The _Princess_ was badly cut alow and aloft, and had her captain, her sailing-master, and a seaman killed, and seven wounded before she surrendered.