Southampton Castle was located in the town of Southampton in Hampshire, England.
 Constructed after the Norman conquest of England, it was located in the north-west corner of the town overlooking the River Test, initially as a wooden motte and bailey design.
 By the late 12th century the royal castle had been largely converted to stone, playing an important part in the wine trade conducted through the Southampton docks.
 By the end of the 13th century the castle was in decline, but the threat of French raids in the 1370s led Richard II to undertake extensive rebuilding.
 The result was a powerfully defended castle, one of the first in England to be equipped with cannon.
 The castle declined again in the 16th century and was sold off to property speculators in 1618.
 After being used for various purposes, including the construction of a Gothic mansion in the early 19th century, the site was flattened and largely redeveloped.
 Only a few elements of the castle still remain visible in Southampton.
Mount Jackson (Mount Andrew Jackson and Mount Ernest Gruening) is a mountain that dominates the upland of the southern part of the Antarctic Peninsula.
 It is located in Palmer Land, within the Antarctic claims of Argentina, Chile and the United Kingdom.
 With an elevation of 3184 m , Mount Jackson is the highest mountain in the Antarctic Peninsula and the British Antarctic Territory.
 Discovered by members of the United States Antarctic Service, 1939–41, it was named for Andrew Jackson, the seventh President of the United States.
 The first ascent of Mount Jackson was made by a team led by John Crabbe Cunningham of the British Antarctic Survey (BAS) in 1964.
 Mount Jackson's geology was studied in 1972 as part of the Palmer Island investigations by a team of geologists.
An outer bailey or outer ward is the defended outer enclosure of a castle.
 It protects the inner bailey and usually contains those ancillary buildings used for the management of the castle or the supply of its occupants.
 These domestic buildings could include workshops, livestock stalls and stables; storage facilities such as barns, sheds and granaries, as well as quarters for servants such as maids, farm workers, and even the castle governors or castellans.
 In many cases there was also a brewery, a bakehouse and a kitchen, if the latter was not located in the hall or "palas".
 An outer bailey was often called a base court in England.
 Depending on topography it could also be referred to as a lower bailey or lower ward, the keep being in the upper bailey or ward.
 Chepstow Castle has lower, middle and upper baileys.
Stephen Allan John Crabbe (born 20 October 1954) is an English former professional footballer.
 He played for six Football League clubs, with his most successful spell coming at Gillingham.
Berwick Castle is a ruined castle in Berwick-upon-Tweed, Northumberland, England.
Mount Cunningham is a mountain at the west end of South Georgia's Esmark Glacier.
 It is situated between Jossac Bight and Queen Maud Bay.
 With an elevation of 1218 m , it is the 16th highest mountain in South Georgia.
 The mountain was named after Scottish mountaineer John Crabbe Cunningham as a memorial after his death on 31 January 1980, following a climbing accident when struck by waves off Holyhead.
The Siege of Eger occurred during the 16th century Ottoman Wars in Europe.
 In 1552 the forces of the Ottoman Empire led by Kara Ahmed Pasha laid siege on the Castle of Eger, located in the northern part of the Kingdom of Hungary, but the defenders led by István Dobó repelled the attacks and defended the castle.
 Later, the siege has become an emblem of national defense and patriotic heroism in Hungary.
An enclosure castle is a defended residence or stronghold, built mainly of stone, in which the principal or sole defence comprises the walls and towers, within the walls one can find the buildings associated with a mediaeval military settlement: a warden's house, barracks, kitchens, stables, a chapel, and a keep.
 Examples include Kenilworth Castle, Clitheroe Castle and Ludlow Castle.
 Many in England are under the protection of English Heritage, which has counted 126 examples.
 There are several in Ireland also, for example King John's Castle, Carlingford.
John Crabbe Cunningham (1927 – 31 January 1980) was a Scottish climber.
 Born in Glasgow, he climbed extensively in the Scottish mountains, where he pioneered new techniques of ice climbing.
John Crabbe (before 1305 – 1352) was a Flemish merchant, pirate and soldier.
 He defended Berwick Castle for the Scots against English forces in 1318, but after being captured by the English in 1332 assisted the English when they again besieged at Berwick in 1333, and became a loyal servant of Edward III, for whom he also fought at the Battle of Sluys.

Question: Where is the castle that John Crabbe defended located?
Answer: Berwick-upon-Tweed, Northumberland, England