...itish Consul at Havana. He was also the owner of the cargo of the steamer Autona, captured some time since. The gunboats of the Potomac flotilla, now on the Rappahannock, under the command of Capt. Samuel McGraw , have lately made several expeditions, some of them with very important results. A few days since several of the gunboats steamed up to the town of Tappahannock, where there was a strong rebel ...