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Harbor Defenses of the Delaware

Commons category link is locally definedForts in DelawareForts in New JerseyForts in PennsylvaniaMilitary units and formations disestablished in 1950
Military units and formations established in 1896Military units and formations in DelawareMilitary units and formations in New JerseyUnited States Army Coast Artillery Corps
Fronts one and two of fort delaware on pea patch island
Fronts one and two of fort delaware on pea patch island

The Harbor Defenses of the Delaware was a United States Army Coast Artillery Corps harbor defense command. It coordinated the coast defenses of the Delaware River estuary from 1897 to 1950, beginning with the Endicott program. These included both coast artillery forts and underwater minefields. The areas protected included the cities of Philadelphia, Camden, and Wilmington along with the Chesapeake & Delaware Canal. The command originated circa 1896 as an Artillery District and became the Coast Defenses of the Delaware in 1913, with defenses initially at and near Fort Delaware on Pea Patch Island near Delaware City. In 1925 the command was renamed as a Harbor Defense Command. During World War II the defenses were relocated to Fort Miles on Cape Henlopen at the mouth of the Delaware Bay.

Excerpt from the Wikipedia article Harbor Defenses of the Delaware (License: CC BY-SA 3.0, Authors, Images).

Harbor Defenses of the Delaware
Maple Boulevard,

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Latitude Longitude
N 39.571388888889 ° E -75.583611111111 °
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Fort DuPont Historic District

Maple Boulevard
19706
Delaware, United States
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Fronts one and two of fort delaware on pea patch island
Fronts one and two of fort delaware on pea patch island
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Fort DuPont
Fort DuPont

Fort DuPont, named in honor of Rear Admiral Samuel Francis Du Pont, is located between the original Delaware City and the modern Chesapeake and Delaware Canal on the original Reeden Point tract, which was granted to Henry Ward in 1675. Along with two other forts of the Harbor Defenses of the Delaware, it defended the Delaware River and the water approach to Philadelphia from 1900 through 1942. In 2016, the acreage which is not in the state park system was annexed into Delaware City. The first fortification built was the Ten Gun Battery, an auxiliary to nearby Fort Delaware during the American Civil War. The Twenty Gun Battery was constructed on the reservation during the 1870s, later followed by a mine control casemate for an underwater minefield in 1876. In 1897-1904, Endicott-era emplacements were constructed for long-range rifles, mortars, and rapid-fire guns. In 1922 the post became headquarters for the 1st Engineer Regiment, which remained at the post until 1941. During World War II, Fort DuPont served as a mobilization station for deploying units, and contained a prisoner-of-war camp for captured German soldiers and sailors. After the war, Fort DuPont was declared surplus and offered to the Veterans Administration for use as a veterans hospital. After they declined, the state bought the site at a 100 percent discount and adapted existing structures for reuse. In 1948, it officially opened as the Governor Walter W. Bacon Health Center. In 1992 a portion was redesignated as Fort DuPont State Park, which became Delaware's 13th state park. In 1999 the site was officially designated the Fort DuPont Historic District after it was listed in the National Register of Historic Places. The historic district comprises Fort DuPont State Park and the Governor Bacon Health Center. The site is currently being redeveloped by the Fort DuPont Redevelopment and Preservation Corporation.

Pea Patch Island
Pea Patch Island

Pea Patch Island is a small island, approximately 1 mi (1.6 km) long, in the U.S. state of Delaware, located in the mid channel of the Delaware River near its entrance into Delaware Bay. It is a low, marshy island, located in New Castle County, facing Delaware City on the Delaware shore, and Finns Point on the New Jersey shore. Once the location of strategic military defenses, the island is currently owned by the State of Delaware as Fort Delaware State Park. The island emerged as a mud bank in the river in the 18th century. According to folklore, the island received its name after a ship full of peas ran aground on it, spilling its contents and leading to a growth of the plant on the island. In the 1790s, Pierre L'Enfant suggested the use of the island as part of the defenses of New Castle, Delaware and Philadelphia. During the War of 1812, a seawall and dykes were built on the island, with a view to building a Martello tower there. By 1814, the island had been sufficiently developed for the construction of the first Fort Delaware. A five-pointed star fort was built 1815–1824. However, this fort was wrecked by a fire in 1831. Construction began on a much larger polygonal fort in 1836, but this project was derailed by a decade-long legal battle over which state owned the island, which was won by Delaware. Construction then began in 1848 on the current fort, with an irregular pentagon design about the size of the previous star fort. The fort was substantially complete by 1860. During the American Civil War, Fort Delaware was used by the Union as a camp for Confederate prisoners, in particular ones captured at the 1863 Battle of Gettysburg. Many of the prisoners and some guards who died at the fort are buried at nearby Finns Point National Cemetery in New Jersey. Around the turn of the century, a large battery for three then-modern 12-inch guns on disappearing carriages was built in the fort as part of the Endicott program, with batteries for smaller guns elsewhere on the island. On the shores flanking the island, Fort DuPont and Fort Mott were built with modern weapons, and preparations were made to lay underwater minefields in the river. The defenses around Pea Patch Island were disarmed during World War II, as Fort Miles at the mouth of the Delaware estuary superseded them. In the early 20th century, the U.S. Army Corps of Engineers dredged a channel around the island, using the infill to double the island's size on its northern end. The island is publicly accessible by ferry from both the Delaware and New Jersey banks. In addition to the historic features of the state park, the island provides a significant wetlands stop for migratory birds along the Atlantic Flyway. It is the location of the largest colony of herons in the U.S. north of Florida.