A Diary of American Events.

May 4.—Captain Howard Dwight, of General Andrew’s staff, was killed near Washington, La, after having surrendered to a party of rebel scouts. General Banks at once ordered the arrest of one hundred white men nearest the place of assassination, to be held until further orders.—The sloop Empress, from Nassau, N. P., for Wilmington, N. C, was captured by the United States steamer Chocura.—The schooner Jupiter, bound to Mobile, Ala., was captured by the gunboat Colorado.—The Ninth regiment of New-York volunteers (Hawkins’s Zouaves) returned to New York from the seat of war in Eastern Virginia.— Captain Smith of the Second California volunteers, attacked a party of hostile Indians fifty miles south of Shell Creek, killing five of them and routing the rest.—The battle in the vicinity of Fredericksburgh, Va., was continued this day, the rebels succeeding in recovering nearly all the defences back of the town.—(Doc. 183.)