The USS Sebago was a significant Union Navy steamer built for service during the American Civil War. She measured approximately 832 long tons (845 tons) and was equipped with very powerful guns and four howitzers, designed to support blockade and combat operations along Confederate ports and waterways. As a double-ended, sidewheel gunboat, she was constructed at the Portsmouth Navy Yard in Kittery, Maine, and was launched on November 30, 1861. She was commissioned on March 26, 1862, under the command of Lieutenant Edmund W. Henry. The vessel’s early service saw her depart Portsmouth, New Hampshire, on April 6, 1862, heading to Hampton Roads, Virginia, to join the North Atlantic Blockading Squadron. She arrived at Newport News on April 11 and was then assigned to support Union operations in the York River and its tributaries, aiding General McClellan’s Peninsula Campaign. Following the Confederate victory in the Seven Days Battles, Sebago moved downstream to the James River, escorting Army transports past Old Point Comfort. Later in July 1862, she was transferred to the South Atlantic Blockading Squadron, arriving off Charleston, South Carolina, on July 29 to enforce the blockade of this vital port. During her service off Charleston, she sustained damage when she ran aground in Wassaw Sound on June 18, 1863. As she was scheduled for overhaul, she sailed north on July 29 and was decommissioned at the New York Navy Yard on July 9, 1863. After repairs, she was recommissioned on December 2, 1863, and transferred to the West Gulf Blockading Squadron, serving in the Gulf of Mexico for the remainder of the war. A key moment in her Gulf service was her participation in the Battle of Mobile Bay on August 5, 1864, a pivotal Union victory. Following the end of hostilities, USS Sebago was decommissioned at the New York Navy Yard on July 29, 1865, and sold in New York City on January 19, 1867. Her service record highlights her role in blockade enforcement, river support, and a notable engagement during the Civil War, marking her as a significant vessel in Union naval operations.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.