Question: Why was the fort viewable from Willard Beach never used? 

Context articles: Fort of Justices
Willard Beach
North City, San Diego
Fort Saulsbury
Fort Gorges
South Portland Bus Service
Jan (Persian name)
Napalm Beach
Geer tube
Horace B. Willard

The Fort of Justices (officially Fort Pajol, French: "Fort des Justices" ) was built in the 1860s or early 1870s located in Montrapon-Fontaine-Écu, Besançon, Franche-Comté.
 It was constructed for use in the Franco-Prussian War to stop the Prussian forces from invading from Vesoul, but was never used in battle and was abandoned.
 It was later demolished in the 1980s.
Willard Beach is a beach and neighborhood in South Portland, Maine.
 The beach, which covers 4 acres, used for swimming as well as commercial and recreational boating.
 Southern Maine Community College abuts the beach.
 Willard Beach is known for its views of Spring Point Ledge Light as well as island forts including Fort Gorges.
North City is a neighborhood in San Diego, California bordered by Solana Beach and Rancho Santa Fe to the north, Del Mar Heights to the west, and Carmel Valley to the south.
 I-5 forms the western boundary.
 The name is almost never used by local residents as the area is already included in either Rancho Santa Fe or Carmel Valley.
 The name is almost exclusively used by the San Diego Police Department for zoning.
Fort Saulsbury was a United States Army coastal defense fort near Slaughter Beach and Milford, Delaware.
 From 1924 to 1943 it was the primary heavy gun defense in the Harbor Defenses of the Delaware.
 In 1943 it was itself superseded by the longer-range 16-inch guns of Fort Miles at Cape Henlopen, Delaware, to which two of Fort Saulsbury's four guns were relocated.
 Fort Saulsbury was named for Willard Saulsbury, Sr., a former US Senator from Delaware.
Fort Gorges is a former United States military fort built on Hog Island Ledge in Casco Bay, Maine.
 Built from 1858 to 1864, no battles were fought there and no troops were stationed there.
 Advancing military technology, including iron clad ships and long range guns, made the fort obsolete before it could be used.
 The fort is now a park, accessible only by boat.
 It was added to the National Register of Historic Places in 1973.
South Portland Bus Service is a municipally-owned suburban provider of mass transportation.
 Because the city of South Portland opted out of the Greater Portland Transit District, this community runs its own separate three-route bus service.
 Two routes serve major shopping areas and loop through major residential streets, funneling residents locally and giving them access to downtown Portland.
 A third route provides access to Willard Beach and Southern Maine Community College, with all three routes going to downtown Portland.
Jan (Persian: جان‎ ‎ ) or Jaan (pronounced like John) is a Persian word originally meaning 'life' and 'soul', also used as a name with extended meanings 'beloved one' or 'dear'.
 In Farsi, it's often added to the end of a given name as a means of conveying affection, for example Ahmad Jan (dear Ahmad).
 It is also added to the end of the words for aunt or uncle, for example "Amoo jan" (Dear uncle).
 It is also often used as part of the names referring to grandmothers or grandfathers, such as Khanoom jan and Agha jan (Dear lady and Dear sir), as the first names of grandparents are never used as a sign of respect.
 Whenever "Jan" is used in Farsi, it implies a certain degree of closeness, familiarity, and affection.
 However, "Jan" is never added to the end of a surname (family name).
 Sometimes, "jan" is also used as a sign or exasperation, in the same way as "My dear lady" or "My dear sir" can be used in English.
Napalm Beach is an American punk rock band from Portland, Oregon.
 One of the longest-running punk bands in the U.S., they are credited by some as being early innovators of the grunge sound.
 Nicholas Pell, writing for the "Portland Mercury" said "a huge influence on the grunge and alternative rock of the 1990s, Napalm Beach never had the name recognition of other Portland bands like Poison Idea or the Wipers."
 Napalm Beach shared the stage with bands such as X, Public Image Ltd., Joan Jett, Johnny Thunders, Gun Club, Bad Brains, Soundgarden, Screaming Trees, Mudhoney, Dead Moon, and Poison Idea.
 They also toured Germany five times between 1989 and 1992.
 During their long musical career they have released more than 30 studio and live recordings in various formats on a number of small independent labels in the U.S. and Germany.
The Geer tube was an early single-tube color television cathode ray tube, developed by Willard Geer.
 The Geer tube used a pattern of small phosphor-covered three-sided pyramids on the inside of the CRT faceplate to mix separate red, green and blue signals from three electron guns.
 The Geer tube had a number of disadvantages, and was never used commercially due to the much better images generated by RCA's shadow mask system.
 Nevertheless, Geer's patent was awarded first, and RCA purchased an option on it in case their own developments didn't pan out.
Horace Birney Willard (May 2, 1825 – April 1, 1900) was an American politician, physician, and businessman from New York City.
 A recipient of a state scholarship, Willard attended Geneva Medical College then established a medical practice in Aztalan, Wisconsin.
 Forced out of the profession due to poor health, Willard became engaged in several business dealings in nearby Fort Atkinson.
 Willard was an early member of the state Republican Party and served a term in the Wisconsin State Assembly.