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NEW YORK, August 10. — The Tribune's special from Harper's Ferry gives the particulars of Averill's victory. Averill attacked the combined forces of McCausland, Johnson, Gillmore and McNeil on the morning of the 7th, and after a spirited fight, completely routed their entire commands, capturing a vast quantity of small arms, four hundred horses and equipments, and four hundred and twenty prisoners, including six field and thirty-two company officers. McCausland, with his demoralized command, fled to the mountains. Our loss is comparatively small — seven killed and twenty-one wounded. Among our killed are Major Congress, 1st Lieutenant Clark, 2d Virginia cavalry. They were struck down while gallantly leading a charge. Capt. Kerr was severely wounded while penetrating the enemy's lines.
The Tribune's Washington special says that Chief Engineer Latimer arrived this morning from the fleet off Mobile, and reports that when he left, active preparations were being made for immediate action by Farragut. He describes Fort Morgan as a brick structure, on the Sumter plan, and banked up as an additional precaution with sand, so that the front is considered impregnable, but being once passed can readily be reduced by an attack from the rear. Farragut having succeeded is passing the fort, we shall doubtless hear of its capitulation or evacuation in a day or two.
Official dispatches from Farragut are expected to-morrow. It was no part of his plan to attempt the capture of the city, but only to relieve a portion of the large fleet which has been stationed there for the past six months.
Maury's statement of the Tecumseh being sunk by Fort Morgan, is totally disbelieved at the navy department. The vessel was not likely to engaged the fort, and no chance shot could have sunk her.
The same correspondent says it is generally believed in the army of the Potomac that Lee has sent Longstreet's corps to Hood's assistance.
The Times' Washington special says a cabinet meeting was held to-day, [unknown]t which questions of state policy of more than ordinary interest and importance were discussed.
It is confidentially stated by those who are intimate in political and social relations with different members of the cabinet, that Stanton has resigned and the president has accepted his resignation. It is not, however, positively known that such is the fact.