GENERAL ORDERS, No. 84. WAR DEPARTMENT, Adjutant Gbnbbal’s Omens, Washington, September 30, 1861. In announcing to the Army the decease of the Commissary General of Subsistence, Brevet Major General George Gibson, who departed this life, at his residence in this city, last night at 12 o’clock, the Secretary of War has a most painful duty to discharge. One by one, during the last few years, the patriarchs of the Army, the veterans of our “Second War of Independence,’’ have been drop- ping into their peaceful graves. The time-honored names of a Towson and a Jesup were no longer borne on the rolls of the living !—and to-day one of the few remaining survivors of their gallant company, and one of the most distinguished, is also numbered with the illus- trious dead. All honor to these worthy sons of the republic, born of it in its golden days—and may the soldiers of our young army strive hard to emulate their bright example, and be as successful, as were they, in preserving escutcheons untarnished by any stain! A native of Pennsylvania, General Gibson, entered the army from civil life, as a Captain of Infantry, in May, 1808. Subsequently pro- moted Major and Lieutenant Colonel, and after haviug served with distinction through the war of 1812-’15, he was disbanded at its close. Reappointed, as Quartermaster General, in 1816, and subsequently made Commissary General in 1818, he rendered invaluable service, in the former capacity, to the army of General Jackson, in Florida, and thereby earned the enduring friendship of that stern old soldier. Brevetted a Brigadier General for faithful service in 1826, and a Major General, for meritorious conduct as Commissary General, during the Mexican war, he has administered the affairs of his department, for a period of over 40 years, to the entire satisfaction, it is believed, of his superiors and the army. The arrangements for his funeral will be ordered by Major General McClellan, commanding the Army of the Potomac. As an appropriate tribute of respect to his memory, there will be fired at every military post, on the day after the receipt of this order, thirteen minute guns, commencing at meridian. The National flag will be displayed at half-staff, from the same hour until sunset of the same day; and for thirty days, the prescribed badge of mourning will be worn by the officers of the Army. order: L. THOMAS, Adjutant General. Official: Assistant Adjutant General.