Built along the bluffs of the Monongahela River in Pittsburgh, Pennsylvania in 1863 by Jones and Laughlin Iron Works[5] in response to the threatened invasion of Pennsylvania by the Confederate States Army, this circular, earthen, Civil War redoubt was also known as "Fort McKinley" or "Fort Ormsby."[1][2] It was located on Ormsby's Hill in what is now Arlington Park, which is located on Arlington Avenue and is bordered by Fernleaf, Salisbury, Sterling, and Fort Hill streets.[3][4]
No remains of the structure were evident as of 2019.