.... Beauregard arrived at Manassas Junction, and assumed command of the rebel forces there.--N. Y. Times, June 6. At night twelve volunteers from Camp Lincoln, near Leavenworth, Kansas, headed by Sergeant Decurin , of the Elwood Guards, armed with Minie rifles and revolvers, marched to latan, Mo., fourteen miles above Leavenworth city, and crossed in skiffs to capture a secession flag. When asked their purpo...