Francis Arnold, General Sigel's cook, and five others, were arrested to-day in the vicinity of Fairfax Court-House, Virginia, for smuggling contraband of war through the lines to the rebels. A quantity of goods in their possession, consisting of swords, shoulder-straps, gold lace, etc., were seized, and the men were sent to the old Capitol Prison at Washington.
The Union pickets near Bolivar Heights, Virginia, were attacked to-day by a party of rebel cavalry, and three of their number were captured.--New York Evening Post.
General Grant, with several divisions of his army from Bolivar, Tennessee, and Corinth, Mississippi, occupied La Grange, Mississippi, this night.--New York Herald.
The English bark Sophia, while attempting to run the blockade of Wilmington, North-Carolina, was destroyed by the National steamers Daylight and Mount Vernon.--Com. Scott's Report.
The United States expeditionary steamer Darlington, with a small force of colored troops  on board, under the command of Colonel O. T. Beard, proceeded to King's Bay, Georgia, and destroyed the extensive rebel salt-works, about a mile from the landing, together with all the property on the place. On returning to the steamer, Colonel Beard's command was attacked by a party of rebels, but they succeeded in reaching the vessel without injury. The colored troops returned the rebel fire, killing two of the enemy.