Fort Delaware Fort Delaware is a harbor defense facility , designed by Chief Engineer Joseph Gilbert Totten , and located on Pea Patch Island in the Delaware River . During the American Civil War , the Union used Fort Delaware as a prison for Confederate prisoners of war , political prisoners , federal convicts , and privateer officers . A three - gun concrete battery , later named Battery Torbert , was built inside the fort in the 1890s and designed by Maj . Charles W . Raymond . By 1900 , the fort was part of the three point concept , working closely with Fort Mott in Pennsville , N . J . and Fort DuPont in Delaware City , Del . The fort and the island currently belong to the Delaware Department of Natural Resources and Environmental Control ( DNREC ) and encompasses a living history museum , located in Fort Delaware State Park . Background . In 1794 , the French military engineer Pierre Charles L ’ Enfant was surveying for defensive sites . He identified an island that he called " " Pip Ash " " as an ideal site for the defense of the prize of American commerce and culture " . The island that L ' Enfant called Pip Ash was locally known as Pea Patch Island . This island was mostly unaffected by humanity with one exception . Dr . Henry Gale , a New Jersey resident , used Pea Patch as a private hunting ground . Gale was offered $ 30 , 000 for the island by the US military , but he refused . The military was determined to get the island , so they appealed to the Delaware state legislature , which seized the island from Dr . Gale on May 27 , 1813 . War of 1812 . During the War of 1812 , efforts were made to fortify Pea Patch Island . This plan of defense was largely coordinated by Capt . Samuel Babcock who was working nearby on similar defenses in Philadelphia . During this time a seawall and dykes were built around the island . There is no known evidence that any progress was made on the actual fortification by war ' s end . The original plan was to build a Martello tower on the island . Star Fort . Construction of a star fort on Pea Patch island began sometime before Dec . 8 , 1817 . Chief Engineer Joseph Gardner Swift mentions a fort on the " Pea Patch in Delaware River " among forts that are progressing nicely . Fort Mifflin ' s Replacement < br > The attack on Fort Mifflin during the Revolutionary War proved that a fort was needed further away from Philadelphia in order to delay possible invaders . A fortification further down river would also provide protection for other vital port cities such as Chester , Marcus Hook , Wilmington and New Castle . On February 7 , 1821 , the Board of Engineers reported : " In the Delaware , the fort on the Pea Patch island , and one on the Delaware shore opposite , defend the water passage as far below Philadelphia as localities will permit : They force an enemy to land forty miles below the city to attack it by land , and thus afford time for the arrival of succors [ . . . ] The two projected forts will also have the advantages of covering the canal destined to connect the Chesapeake with the Delaware [ . ] " Construction Issues < br > The star fort was designed by army engineer Joseph G . Totten and construction was supervised by Capt . Samuel Babcock . Babcock supervised the work from about August 1819 until August 20 , 1824 . Lt . Henry Brewerton was also onsite , serving as an assistant engineer the during construction . Completion of the project was delayed years past the proposed date due to uneven settling , improper pile placement and the island ' s marshy nature . In once occurrence an entire section of 43 , 000 bricks had to be taken down , cleaned and reworked due to massive cracking . In 1822 , Colonel Totten and General Bernard were on the island to inspect the faulty works . In fact , Captain Babcock was severely criticized for altering Totten ' s plans without orders . Babcock subsequently appeared before a courts martial for his actions in late 1824 . It was determined he was not guilty of neglect but rather error in judgement and he was acquitted . During the trial his council was George Read Jr . of New Castle , Del . Commanders and Garrison < br > Fort Delaware ' s first documented commander was Maj . Alexander C . W . Fanning , who took command sometime before 1825 . That year , a letter documenting a lost mail shipment was written by him as post commander . Army records the fort was manned by soldiers of the 2nd U . S . Artillery . Sometime around 1829 , Maj . Benjamin Kendrick Pierce took command of Fort Delaware . During his tenure , the fort was garrisoned by Companies A and B , 4th U . S . Artillery . Major Pierce was a graduate of Dartmouth College and the older brother to the 14th President of the United States , Franklin Pierce . 1831 Fire < br > In February 1831 , the U . S . Army Corps of Engineers sent Lt . Stephen Tuttle to evaluate the foundation issue and offer possible solutions . On Feb . 8 , 1831 , around 10 : 30 p . m , a fire originating in Lieutenant Tuttle ' s quarters , destroyed much of the work , burning until the next morning . Maj . Benjamin K . Pierce , post commander , was granted orders to use the federal arsenal in New Castle , Del . as barracks for his two companies until " Fort Delaware can be reoccupied . " Captain Richard Delafield , Babcock ' s replacement , asked for $ 10 , 000 to tear down the remaining structure the following year . In 1833 , Fort Delaware was torn down to make room for a new fortification . According to official records , the rubble from the star fort served to re - enforce the seawall around the island . The sandstone remnants can still be seen today . Polygonal Fort . Captain Delafield designed the second version of Fort Delaware " as a huge bastioned polygonal form to be built in masonry . " Delafield desired his fort to be " a marvel of military architecture on Pea Patch . " In 1836 , excavation work progressed on the north side of the island . Grillage timbers were driven into the island ' s soft mud to serve as a base for the foundation of Delafield ' s fort . In 1838 , Joseph T . Hudson of New Jersey ( descendent of Dr . Henry Gale ) sent legal representation to the island , claiming he had legal rights to the island . Delafield ' s fort was never built due to this decade long legal battle over island ownership . The suit was eventually decided in Hudson ' s favor ; the government was obligated to pay him $ 1 , 005 . 00 for the island . Pentagonal Fort . The present Fort Delaware was erected mainly between 1848 and 1859 , becoming the largest third - system fortification completed in the United States at the time . Although major construction was wrapped up before the Civil War , the post engineer did not declare the fort finished until 1868 . Construction of the counterscarp wall , slate pavement , and " hanging shutters and doors " were still ongoing . The fort was designed by Army chief engineer Joseph G . Totten , and construction was supervised by Major John Sanders . Engineers in supporting roles included Captain George B . McClellan , Major John Newton , Lieutenant William Price Craighill , Lieutenant Montgomery C . Meigs and civilian engineer Edwin Muhlenbrach . Foundation < br > Construction of a deep foundation was necessary since the island ' s soils were of " a compressible mud often forty feet deep ; the level where sand was finally reached . " In 1849 , Sander ' s crews began using steam - powered drivers to place long piles ( similar to modern telephone poles ) in excavated areas to provide adequate support . In 1850 , pile driving was complete ; crews had driven 4 , 911 piles , reusing 1 , 095 piles from the Delafield fort . Because of the star fort ' s failed foundation , Totten and Sanders decided to evaluate the weight resistance before moving forward with construction . The engineers proposed a singular test consisting of 30 blows from a 8 - foot height using an 800 pound weight . A total of 5 , 754 piles were tested and 2 , 955 failed more than one fifth of an inch . Roughly 1 , 700 piles were subsequently spliced and re - driven an additional 10 to 20 feet . The pile driving was finally complete in 1851 and the wooden grillage was the next layer constructed . Stonework < br > The fort is primarily composed of gneiss , granite , brick and cement . Initially , the stone for the scarp wall was gneiss imported from Port Deposit , Md . In 1852 , Major Sanders reported the gneiss was too hard for his stone masons and cutters to shape , slowing the progress of construction . After that , purchase records show granite was bought from John Leiper ' s quarry in nearby Delaware County , Pa . Leiper ' s granite was also used throughout for various items such as the steps for the circular stairways . Stone from Vinal Haven , Maine was used for the stairways ' large platforms . A huge storm damaged the island ' s dyke and seawall in 1854 . Due to the threat high - tide waters , efforts were directed toward repairing the dyke and adjacent seawall , slowing progress on the stonework . Brickwork < br > More than two million bricks were purchased from Wilmington , Del . and Philadelphia , Pa . for the scarp wall ' s interior . These bricks were used in construction of underground cisterns , casemates , powder magazines , soldier barracks , officer quarters , bread ovens and the fort ' s breast high wall . Masonry arches and vaults were used throughout the entire fort to equally distribute weight and to provide stability . Poured concrete was used as a layer above the vaults to offer counter resistance and to " create a strong floor system . " Major Sanders Dies < br > On July 29 , 1858 , Major Sanders died on the island due to " complications of carbunculous boils ; " Lt . William Craighill replaced him until Maj . John Newton was able to assume the role of supervising engineer . In 1859 , in official correspondence , Major Newton reported that the fort would be ready to armament and garrison by 1860 . In 1861 , before the war started , Capt . Augustus A . Gibson took command of the fort and a small garrison of only 20 regular army soldiers . Construction languished until the end of the Civil War ; redirected focus was centered on mounting cannon inside the fort . In 1861 , 20 columbiad guns were received and work to mount these guns quickly began . By 1862 , another 17 guns were delivered here . By 1866 , approximately 156 guns , were mounted in total , filling the fort ' s casemates and ramparts to capacity . Civil War . During the Civil War , Fort Delaware went from protector to prison ; a prisoner - of - war camp was established to house captured Confederates , convicted federal soldiers , local political prisoners as well as privateers . The first prisoners were housed inside the fort in sealed off casemates , empty powder magazines , as well as two small rooms inside the sally port . In those small rooms , names of confederates can still be seen carved into the brick . According to the " Philadelphia Inquirer " , the island " contained an average population of southern tourists , who came at the urgent invitation of Mr . Lincoln . " The first Confederate general to be housed at the fort was Brig . Gen . Johnston Pettigrew . During the war , a total of about a dozen generals were held within the fort as prisoners - of - war . Barracks & Hospital < br > In 1862 and 1863 , two separate phases of construction took place , building " barracks for enlisted prisoners of war " that was known as the " bull pen , " said Pvt . Henry Robinson Berkeley a Confederate prisoner . Most of the Confederates captured at Gettysburg were imprisoned here . An L - shaped barracks building , using similar plans , was constructed for Union regiments assigned as guards . A 600 - bed hospital was also built around the same time and was designed by noted architect John McArthur Jr . of Philadelphia . " These Barracks [ sic ] were common wooden sheds , affording accommodation for about ten thousand persons , " wrote Lt . Francis W . Dawson , a confederate POW captured in August 1862 . " The bunks were arranged in tiers of three , and into one of these I crawled . The next morning I was told that these Barracks were the quarters for the privates and non - commissioned officers , and that , by requesting it , I could be removed to the quarters for the officers , which were inside the Fort . " Mortality Rate < br > The first Confederate prisoner to die at Fort Delaware was Captain L . P . Halloway of the 27th Virginia Infantry . He was captured at Winchester , Va . on March 23 , 1862 , dying on April 9 . Captain Halloway , a Freemason , was given a full Masonic funeral by Jackson Lodge in Delaware City . The funeral procession was led by fort ' s commander , Captain Augustus A . Gibson , from the town ' s lock on Clinton Street , and ending in the cemetery on Jefferson Street . According to church records , Halloway ' s body was reclaimed by family after the war . By August 1863 , there were more than 11 , 000 prisoners on the island ; by war ’ s end , it had held almost 33 , 000 men . The conditions were decent , but about 2 , 500 prisoners died on Pea Patch Island . Statistically , the overall death rate for prisoners was about 7 . 6 percent . Half of the total number of deaths occurred during a smallpox epidemic in 1863 . Inflammation of the lungs ( 243 deaths ) , various forms of diarrhea ( 315 deaths ) and smallpox ( 272 deaths ) were the leading killer amongst the prison population . About 215 prisoners died as a result of Typhoid and / or Malaria , according to records in the National Archives . Other causes of death include scurvy ( 70 deaths ) , pneumonia ( 61 deaths ) and erysipelas ( 47 deaths ) . Five prisoners drowned , and seven died from gunshot wounds . During the war , 109 Union soldiers and about 40 civilians died on the island as well . Prisoner Rations and Living Conditions ( outside the fort ) < br > By 1863 , enlisted men and junior officers ( mostly lieutenants and captains ) of the prison population were living in the wooden barracks on the northwest side of the island . These two classes of prisoners were separated by a tall fence complete with a catwalk for the guards . In 1864 , the War Department ordered the rations to be cut in retaliation for the treatment of Northern soldiers in southern POW camps . Although prisoners were only receiving two small meals , they were allowed to purchase extra food from the sutler , and allowed to fish in the waterways on the island and in the Delaware River . Official records also show that prisoners at Fort Delaware received more care packages than any other POW camp in the country . " Things here are not quite as bad as I expected to find them . They are , however , bad , hopeless and gloomy enough without any exaggeration , " said Pvt . Henry Berkeley . " We went into dinner about three o ' clock , which consisted of three hardtack , a small piece of meat ( about three bites ) and a pint tin cup of bean soup . We only get two light meals a day . " " The mess - room is next to [ Division ] " 22 " and near " the rear " . It is a long , dark room , having a long pine table , on which the food is placed in separate piles , either on a tin plate or on the uncovered greasy table , at meal hours , twice a day , " said Capt . Robert E . Park , 12th Alabama Infantry Regiment . " The fare consists of a slice of baker ' s bread , very often stale , with weak coffee , for breakfast , and a slice of bread and a piece of salt pork or salt beef , sometimes , alternating with boiled fresh beef and bean soup , for dinner . The beef is often tough and hard to masticate . " " There are several large ditches running across the island which are filled daily by the bay water and which furnish the water for washing , " wrote Capt . William H . Burgwyn , 35th North Carolina Infantry . " Our drinking water is brought from Brandywine Creek about ten miles [ away ] . " Prisoner Rations and Living Conditions ( inside the fort ) < br > High - ranking Confederate officers and some political prisoners were housed in former laundress quarters and open - bay barrack rooms inside the fort . These prisoners were often afforded paroles of the island , access to more food , and allowed more freedoms than the outside prison population . " By the kindness of Gen . Albin Francisco Schoepf , Cols . Morgan , Tucker , Coleman and myself were paroled to the Island " , said Col . William W . Ward , on March 24 , 1864 . Gen . M . Jeff Thompson , Gen . Robert B . Vance and the Cols of our command form a mess , and live very well . We give a negro woman $ 7 . 00 per week for cooking , $ 10 . 00 for washing . " Also living in the former laundress quarters was Reverend Isaac W . K . Handy of Portsmouth , Va . , a political prisoner . " Our supplies have , recently , been so abundant , that ' Commissary ' Tibbetts has appropriated [ Room ] No . 3 as a larder and pantry . We have been living upon hams , turkeys , chickens , tongues , jellies , pickles , butter , cheese , canned fruits , and jellies of various kinds , with all else that could be desired for comfortable and healthy diet , " wrote Reverend Handy in 1864 . He further notes , " The only article regularly furnished by the Government commissary is bread . Each man gets a well baked loaf , every other day , which is quite sufficient in quantity . " " We were installed in a large barrack - room , which then contained seventy or eighty officers . The highest in rank was a Major Holliday , " wrote Lt . Francis W . Dawson . " Our room was dry , warn and well lighted , while the Barracks [ outside of the fort ] were cold , damp and dark . Our room had conveniences for washing [ . . . ] , and there was plenty of water of a poor quality , " said Dawson . " We only left the room to march down into the mess - hall . " In late 1862 , prisoners inside the fort were fed three meals a day instead of the usual two . " For breakfast we had a cup of poor coffee without milk or sugar , and two small pieces of bad bread . For dinner we had a cup of greasy water misnamed soup , a piece of beef two inches square and a half inch thick , and two slices of bread . At supper the fare was the same as at breakfast . This was exceedingly light diet , " wrote Lt . Francis Dawson . " We contrived to make some additions to our diet by purchases at the Sutler ' s store . " Immortal 600 < br > On August 20 , 1864 , six - hundred Confederate officers boared the " Crescent " bound for Morris Island , S . C . , " for the purpose I believe of being placed under the fire of the Confederate batteries in retaliation for an equal number of Federal officers who have been placed in the city of Charleston , and are said to be exposed to the shelling of their own guns . I am glad of this move as it will be a diversion to the monotonous life led in prison , " said Capt . Leon Jastremski of the 10th Louisiana Infantry . This group of prisoners was later known as the Immortal Six Hundred . " Aug . 20 - Am detailed to go to Charleston with the Rebel Officers . Was very busy in the forenoon hunting up shoes and packing up things , " said Pvt . Alexander J . Hamilton , Pittsburgh Heavy Artillery . " At 3 p . m . we fell in and marched up to the barracks and by 5 were on board the Crescent and under way . There are 35 of our boys and about 90 of the other two batteries and of Company C , 157th Ohio [ Infantry ] . " " After long delay - all being ready - the guards took their places , and the command was given to march through the sally - port , to the west end of the " bull - pen " , " according to Reverend Isaac Handy . " As the noble fellows marched out , I stood at the opening of the sally - port , as near by as the guards would allow , and until the very last man disappeared from the enclosure . ' Good - bye ! Good - bye ! ' was uttered , time and again , as the files moved on ; and I could do nothing but return farewells , as some one or more in every rank would wave the parting salutation . " Garrison Units < br > Starting in 1861 , volunteer troops were sent to garrison Fort Delaware that included , Collis ' Zouaves de Afrique , 19th New York Volunteers , Mlotkowski ' s Independent Battery A , Young ' s Independent Battery G ( Pittsburgh Heavy Artillery ) , 5th Delaware Infantry , 6th Delaware Infantry , 9th Delaware Infantry , 5th Maryland Infantry , 11th Maryland Infantry , 6th Massachusetts Infantry ( 100 Days ) , 157th Pennsylvania Infantry ( Battalion ) , 201st Pennsylvania Infantry , 215th Pennsylvania , 157th Ohio Infantry , 196th Ohio Infantry , and zouaves of the 165th New York Infantry . The fort was also used to organize and muster troops from the first state . Ahl ' s Independent Battery of Heavy Artillery was organized here for garrison duty . Although listed as a Delaware unit , Ahl ' s Battery was composed of Confederate prisoners that took the oath of allegiance . The fort ' s artillery soldiers were responsible for manning the guard posts within the fort as well as serving on various duty positions on the island . Infantry troops were mainly responsible for manning guard posts along the seawall , which ran around the island . In August 1864 , there were approximately 85 guard posts on the island that required about 255 men on each shift . 1870s and 1880s . After the Civil War , the fort was operated by a small garrison of the 4th U . S . Artillery . In the early 1870s , plans were made to modify the five bastions to support 15 - inch Rodmans . In October 1878 , a massive hurricane struck the area causing considerable damage to structures outside the fort . The majority of buildings on the south side of the island were destroyed . The Trinity Chapel , built in 1863 by Confederate POWs , was partially destroyed in the storm . The chapel was subsequently used to store hay until totally demolished sometime after 1901 . On August 3 , 1885 , a tornado struct the island destroying the post - war hospital and caused considerable damage to other structures . " A storm took place here . We have had nothing like it since [ October 1878 ] and a strong whirlwind with it , sweeping every thing before it , pulling trees out of the ground and carrying parts of the hospital all over the island and out on the river , " wrote Ordnance Sergeant James Maxwell . Spanish - American War . Before the start of the war , in 1892 , a mine control casemate was built on the northern tip of the island . This casemate was built semi - underground and then covered with dirt for concealment . This mining casemate served in conjunction with a one - story torpedo shed and a narrow - gauge railroad , which all supported water - tight mines that could be placed in the Delaware River as a defensive measure against a possible enemy attack . A similar mine casemate here was planned in 1870s but never materialized due to lack of funding . Modernization during the Endicott period . During the late 1890s , new gun batteries were constructed at Fort Delaware . These batteries were part of a program initiated by the Endicott Board , a group headed by the Secretary of War , William C . Endicott . Instead of many guns concentrated in a traditional thick - walled masonry structure , the Endicott batteries are spread out over a wide area , concealed behind concrete parapets flush with the surrounding terrain . In 1896 , half of the soldier barracks and a set of officer quarters were demolished inside the fort . The parade ground was excavated and thousands of piles were steam driven to support a foundation for a concrete three - gun battery as a way to modernize the defenses protecting ports along the Delaware River . Construction halted for a brief period until resuming in August 1897 . This main battery was designed by Army engineer Lt . Col . Charles W . Raymond assisted by Lt . Spencer Cosby . The new Endicott section was a three - story reinforced concrete emplacement , which was built to support three 12 - inch breech - loading rifled guns on disappearing carriages . These guns , mounted in 1900 , had a range approximately 8 . 5 miles . The three - gun battery , later named Battery Torbert after Maj . Gen . Alfred Torbett , is the only three - story Endicott section in the United States . On top of the fort , flanking the 12 - inch battery , were two smaller rapid - fire batteries , which protected the short - range sectors around the island and the mine field . These positions were later named Battery Allen and Battery Alburtis , according to Army general orders . Outside of the fort , engineers built additional rapid - fire batteries , which were later honored as Battery Dodd and Battery Hentig . During the Spanish - American War , the fort was garrisoned by artillery soldiers of the 4th U . S . Artillery and volunteers from Company I of the 14th Pennsylvania Volunteer Infantry Regiment . Names of soldiers from the 14th P . V . I . appear today , carved on the brick walls inside the fort . These soldiers were stationed on the island during the summer of 1898 . World War I . Following a period of care - taking status , the fort was garrisoned for a brief time during the Great War . Nearby Fort DuPont was the main defense site with Fort Delaware and Fort Mott serving as a sub - posts , according to army records . In March 1919 , soldiers began the process of mothballing the old fort , removing everything except items pertaining to the three 12 - inch guns of Battery Torbert , according to Pvt . James C . Davis , a Fort DuPont soldier who worked on the detail . In a " Newark Post " article , he recalls his orders were to bury everything with explicit orders not to throw anything in the river or remove articles from the island . According to Davis , soldiers buried three pieces of artillery on the island . Only one gun has since been recovered ; a 15 - inch Rodman gun exhumed from the northwest bastion was sold for scrap during World War II . By the end of the Great War , Fort Saulsbury in Milford , Del . was near completion , and with longer range guns rendered the three forts as secondary lines of defense . World War II . Following the attack on Pearl Harbor , the island was garrisoned by a detachment of soldiers from Battery C , 261st Coast Artillery Battalion , a unit from the Delaware Army National Guard . Battery C manned the two rapid - fire guns of Battery Hentig , located outside of the fort . The fort was eventually striped of the most of the electrical wiring , which was re - used at Fort Miles in Lewes , Del . Fort Delaware was declared as a surplus site by the federal government at the end of the war . The Fort Today . Delaware acquired the fort from the United States government in 1947 after the federal government declared it a surplus site . Today , Fort Delaware State Park encompasses all of Pea Patch Island , including the Fort . Transportation to the island is provided via ferry . Once at the island , visitors are brought to the fort on a jitney . Tours and special programs are available to visitors . For example , visitors may see , daily , the 8 inch Columbiad gun fired which is located on the northwest bastion . Park staff , AmeriCorps members , and Fort Delaware Society volunteers interpret the roles of people who were at the fort during the Civil War . Beach erosion affecting Pea Patch Island was recognized as a potential threat to the Fort in 1999 . The United States Army Corps of Engineers erected a 3 , 500 - foot - long seawall during the Winter of 2005 - 2006 which now protects the historical fort site and a migratory bird rookery , considered to be the largest such habitat north of Florida . Popular Events < br > Each year in the second week of June , there is an " Escape from Fort Delaware " triathlon , where entrants follow in the footsteps of the 52 escapees from the Civil War prison . A boat shuttles the athletes out to Fort Delaware , a Civil War historical interpreter fires a musket to start the race , the swimmers jump into the Delaware River , and swim back to land and then do the bike and run events , finishing on the town green in Delaware City , Delaware . Starting in 2009 , the non - profit Delaware Ghost Hunters and park staff lead walking tours / paranormal investigations on Friday and Saturday nights in September and October . There are usually two tours each night starting at 6 : 30 p . m . and 9 : 30 p . m . respectively . Tickets can be purchased online from the Delaware State Parks ' website . Also starting in 2009 , Fort Delaware has hosted at least one game each summer of the Diamond State Base Ball Club , a vintage base ball team . The Diamond State Base Ball Club also typically plays 4 - 6 games per year at nearby Fort DuPont . The Diamond State Base Ball Club is a non - profit amateur organization created for the purposes of providing physical fitness to its members , educating the public on the history of baseball and local history , and serving as a point of public pride . Since 2011 , Fort Delaware State Park ' s " Appetite for Apparitions " has been a popular night - time program , offering dinner at Crabby Dicks in Delaware City followed by a ferry ride to the island for ghost stories . Television & Pop Culture < br > The A & E Network ' s " Civil War Journal " recorded portions of an episode at the fort entitled " War Crimes : The Death Camps " that originally aired Oct . 9 , 1994 . Fort Delaware has its share of ghost stories and has recently been under investigation for paranormal activity . The Sci - Fi Channel investigation series " Ghost Hunters " conducted two cases there including a live televised investigation on Halloween in 2008 . The Sci Fi Channel investigation series " Ghost Hunters Academy " recorded an episode , which aired June 23 , 2010 . The British series " Most Haunted " also did an investigation of the fort in their 11th series of the show .