A Diary of American Events.

September 25.—The English steamer William Penn, which was captured near the Rio Grande, arrived at New-Orleans. — Spencer Kellogg Brown, condemned by the rebels as a spy, was hung at Richmond, Va.—A fight took place near Upperville, Va., between Major Cole’s command of National cavalry, and about one hundred and fifty guerrillas belonging to Mosby’s gang, in which the latter were defeated and put to flight. Major Cole recaptured seventy-five horses and mules, and one mar belonging to the Nineteenth New-York cavalry, besides killing one of the guerrillas and capturing nine.—A party of guerrillas attacked the Union garrison at Donaldsonville, La., but were repulsed, and compelled to retire with slight loss.