Early Portsmouth forts (1705). The first fort in the Portsmouth area was
Fort William and Mary (called The Castle until circa 1692) in
New Castle, initially garrisoned before 1632 and perhaps the oldest continuously fortified site in the British colonies that later became the United States. In 1680 another small fort was established on the site of the later
Fort McClary in Kittery, Maine, then a part of
Massachusetts. This was called Fort Pepperrell after its builder,
William Pepperrell. In 1720 this became a permanent battery of six guns named Fort William. In 1746 Battery Cumberland was built at Jaffrey's (Jerry's) Point in New Castle. Both Fort William and Mary and Fort William figured in the
American Revolution. On 14–15 December 1774 Fort William and Mary was raided twice. On the first night a large group of
patriots led by
John Langdon overpowered a six-man
caretaker detachment and confiscated much of the fort's supply of gunpowder. On the second night another raid under
John Sullivan seized 16 of the fort's cannon and a number of muskets. These raids were the first acts of the Revolution in New Hampshire. In 1775 Fort William was seized by New Hampshire militia and expanded. Both were built in 1775 and were named for George Washington and local hero John Sullivan. Fort Washington was a star-shaped earthwork. Both forts were commanded by Captain
Titus Salter (or Salten) during the Revolution. They were re-garrisoned in the War of 1812 and abandoned after that war. Following the Revolution Fort William and Mary was called Castle Fort or Fort Castle. Fort Sullivan at the Navy Yard was rebuilt in 1861 with eleven 8-inch
Rodman guns. An
underwater minefield also guarded the harbor, initially controlled from a mine casemate at Fort Stark. A Civil War-era battery of four 100-pounder (6.4-inch, 163 mm)
Parrott rifles at Fort Constitution was also available. The 8-inch guns were removed in 1900 to arm new Endicott batteries elsewhere and to make room for the new batteries at Fort Stark; the 15-inch guns and Parrott rifles remained at least through the end of 1903. while 5-inch and 6-inch guns became
field guns on wheeled carriages. However, few railway artillery pieces were mounted and few or none saw action before the
Armistice. The remounted 5-inch and 6-inch guns were sent to France, but their units did not complete training in time to see action. All three 10-inch guns from Fort Foster, both 8-inch guns from Fort Constitution, and both 6-inch guns from Fort Stark were removed; after the war the 10-inch guns were returned, but the 6-inch guns were stored and the 8-inch guns probably became railway artillery. References indicate the authorized strength of CD Portsmouth was 10 companies, including four from the
New Hampshire National Guard. Early in 1942 the fort was temporarily armed with four
155 mm guns on towed mounts, placed on circular concrete "
Panama mounts". Battery 204 with two
6-inch guns on long-range carriages was constructed at the same time as Battery Seaman; the similar Battery 205 at Fort Foster was built but not armed. Another, less detailed source states the regiment was dissolved on 7 October 1944. The battery was initially part of the
Harbor Defenses of Boston, but was transferred to HD Portsmouth with the construction of a fire control station for Fort Dearborn. Numerous
fire control towers and other structures were built from Kennebunkport, Maine to Cape Ann, Massachusetts to support HD Portsmouth, particularly the 16-inch guns at Fort Dearborn. The
US Navy also participated in defending the Portsmouth area with
net defenses and submarine-detecting
indicator loops, including a station on
Appledore Island in the
Isles of Shoals (Station 1G). Following mobilization in 1940 HD Portsmouth was subordinate to
First Army. On 24 December 1941 the Eastern Theater of Operations (renamed the
Eastern Defense Command three months later) was established, with all
east coast harbor defense commands subordinate to it, along with
antiaircraft and fighter assets. This command was disestablished in 1946.
Post World War II Following the war, it was soon determined that gun defenses were obsolete, and they were scrapped by the end of 1948, with remaining harbor defense functions turned over to the Navy. ==Present==