USS Niagara (1813) in the context of Downtown Erie

Erie is a city on the south shore of Lake Erie and the county seat of Erie County, Pennsylvania, United States. It is the fifth-most populous city in Pennsylvania and the most populous in Northwestern Pennsylvania with a population of 94,831 at the 2020 census. The two-county Erie Metropolitan Area had a population of 270,876 in 2020. Erie is about 80 miles (130 km) from Buffalo, 90 miles (140 km) from Cleveland, and 120 miles (190 km) from Pittsburgh.

The city takes its name from the Native American Erie people, who inhabited the area until the mid-17th century. Its nicknames include "Gem City", a reference to its fine natural harbor, the "Gem of the Great Lakes"; and more recently, "Flagship City", from a local marketing effort to play up the homeport of Oliver Hazard Perry's flagship Niagara.

A battle ensign is the name given to a large war ensign (flag) hoisted on a warship's mast just before going into battle.

In what could become a very confusing situation with thick clouds of gunsmoke the ensign gave additional identification, hence their large size, which for the Royal Navy in the 17th and 18th centuries was about 20 by 40 ft (6.1 by 12.2 m). It was commonly accepted that so long as a ship flew its ensign it was an active participant in battle; prior to action it was an acceptable ruse to fly a false flag.