ORDERS. ADJUTANT GENERAL’S OFFICE, Washington, April 23, 1862. The Adjutant General with unfeigned regret announces to the officers of his Department the decease of one of their number, most highly valued as an officer and gentleman. Major Theodore Talbot, Assistant Adjutant General, died in this city yesterday, while on duty as Chief of Staff to Brigadier General Wadsworth, Military Governor of the District of Columbia. Major Talbot was the son of the late Senator Isham Talbot, of Kentucky. He was a member of Fifemont’s expedition to the Bocky Mountains in 1845-6, and when the flag of the United States was raised by that officer in California, on the breaking out of the war with Mexico, was appointed and continued to serve as Adjutant of the Battalion of Mountaineers, Guides, &c., which ccBperatt d with the Navy in the conquest of the country. Appointed Second Lieutenant of the 1st Begiment of Artillery in May, 1847, he served in Mexico till the close of the w?ar. From May, 1849, until February, 1853, he wras on duty in Oregon, where he acted as Chief of Staff to the Department Commander. Subsequently, during the last war with the Indians, he was wdth his Company in Florida, where he again acted as Chief of Staff. The Company to which he belonged being stationed in Charleston Harbor at the commencement of the rebellion, he was one of those beleagured in Fort Sumter, and only missed being present at the bombardment of that Fort by having been selected as the bearer of confidential despatches from Major Anderson to the Government of the United States, and, on his return to Charleston, being refused permission by the State authorities to rejoin his Company. He was appointed Assistant Adjutant General in April, 1861, and v as Chief of Staff to Brigadier General Mansfield, Military Commander in the city of Washington, during the momentous time of his command. His early death was no doubt hastened by the arduous duties he so faith- fully performed during these last two periods of his service. 2 As a tribute to the memory of this accomplished officer and amiable man, the officers of the Adjutant General’s Department will wear the usual badge of mourning for thirty days. L. THOMAS, Adjutant General. Official: Assistant Adjutant General