General McClernand and staff dashed off, and were soon in the enemy’s intrenchments, surrounded by thousands of the men. When the flag was shown on the river side, the jolly Jack Tars jumped ashore, and were soon in the fort, followed by Admiral Porter and a number of his officers. Colonel Dunnington, commander of the fort, surrendered his sword to the Admiral in person. General Churchill, commander of the forces, soon appeared with his staff, and surrendered himself and his troops to General McClernand. General Churchill accused his subordinates of treachery. It may be, that the soldiers, seeing that further resistance was useless, concluded to abandon the defence. One thing is certain, there was great unanimity among the rebels in the surrender. ADMIRAL PORTER. The following sketch of Admiral Porter, who commanded the gunboat attack, will inform the reader of his previous history: ACTING REAR-ADMIRAL DAVID D. PORTER, the commander of the Mississippi Flotilla, is the son of the famous Commodore David Porter of the _Essex_, and was born about the year 1814. In 1829 he entered the navy as midshipman on board the _Constellation_, and served six years on that ship and the _United States_. In 1835 he passed his examination, and served six years as passed midshipman on the Coast Survey. In 1841 he was commissioned a lieutenant, and served with that rank on board the _Congress_ for four years. After a brief period of service at the Observatory at Washington, he was placed on active duty under Commodore Tattnall in the Gulf of Mexico, and took a leading part in the naval operations of the Mexican war. In 1849 he took command of one of the Pacific Mail Company’s steamers, and remained several years in the service of that Company.