Question: When did the operator of Tidworth Camp invade the island?

full_context: Document 1: Brigade of Guards: The Brigade of Guards was an administrative formation of the British Army from 1856 to 1968. It was commanded by the Major-General commanding the Brigade of Guards and was responsible for administering the guards regiments.
Document 2: Canadian Armed Forces: Currently, the Regular Force component of the Army consists of three field-ready brigade groups: 1 Canadian Mechanized Brigade Group, at CFB Edmonton and CFB Shilo; 2 Canadian Mechanized Brigade Group, at CFB Petawawa and CFB Gagetown; and 5 Canadian Mechanized Brigade Group, at CFB Valcartier and Quebec City. Each contains one regiment each of artillery, armour, and combat engineers, three battalions of infantry (all scaled in the British fashion), one battalion for logistics, a squadron for headquarters/signals, and several smaller support organizations. A tactical helicopter squadron and a field ambulance are co-located with each brigade, but do not form part of the brigade's command structure.
Document 3: Saint Barthélemy: Agricultural production on the island is difficult given the dry and rocky terrain, but the early settlers managed to produce vegetables, cotton, pineapples, salt, bananas and also fishing. Sweet potato is also grown in patches. The islanders developed commerce through the port of Gustavia. Duty-free port attractions, retail trade, high-end tourism (mostly from North America) and its luxury hotels and villas have increased the island's prosperity, reflected in the high standard of living of its citizens.
Document 4: Saint Barthélemy: Marine mammals are many, such as the dolphins, porpoises and whales, which are seen here during the migration period from December till May. Turtles are a common sight along the coastline of the island. They are a protected species and in the endangered list. It is stated that it will take 15–50 years for this species to attain reproductive age. Though they live in the sea, the females come to the shore to lay eggs and are protected by private societies. Three species of turtles are particularly notable. These are: The leatherback sea turtles which have leather skin instead of a shell and are the largest of the type found here, some times measuring a much as 3 m (average is about 1.5 m) and weighing about 450 kg (jellyfish is their favourite diet); the hawksbill turtles, which have hawk-like beaks and found near reefs, generally about 90 cm in diameter and weigh about 60 kg and their diet consists of crabs and snails; and the green turtles, herbivores which have rounded heads, generally about 90 cm in diameter and live amidst tall sea grasses.
Document 5: David Mostyn: Educated at Downside School and at the Royal Military Academy, Sandhurst, David Mostyn was commissioned into the Oxfordshire and Buckinghamshire Light Infantry in 1949. He was mentioned in despatches for helping to suppress the Brunei Revolt in 1962 whilst serving with the 1st Green Jackets (43rd and 52nd). In 1969 he was appointed Commanding Officer of the 2nd Battalion The Royal Green Jackets and was deployed to BAOR and Northern Ireland. In 1972 he went on to command the 8th Infantry Brigade. In 1980 he became Commandant of the British Sector in Berlin and in 1983 he was appointed Military Secretary. He went on to be Adjutant General in 1986 retiring from the British Army in 1989.
Document 6: Norfolk Island: Norfolk Island has 174 native plants; 51 of them are endemic. At least 18 of the endemic species are rare or threatened. The Norfolk Island palm (Rhopalostylis baueri) and the smooth tree-fern (Cyathea brownii), the tallest tree-fern in the world, are common in the Norfolk Island National Park but rare elsewhere on the island. Before European colonization, most of Norfolk Island was covered with subtropical rain forest, the canopy of which was made of Araucaria heterophylla (Norfolk Island pine) in exposed areas, and the palm Rhopalostylis baueri and tree ferns Cyathea brownii and C. australis in moister protected areas. The understory was thick with lianas and ferns covering the forest floor. Only one small tract (5 km2) of rainforest remains, which was declared as the Norfolk Island National Park in 1986.
Document 7: Scott Grant: Educated at The King's School, Pontefract, the Royal Military Academy Sandhurst and Clare College, Cambridge, Scott Grant was commissioned into the Corps of Royal Engineers in 1965. He became Director-General Training & Doctrine for the Army in 1991, Team Leader for the Command Structure Review in 1993 and General Officer Commanding UK Support Command (Germany) in 1994. In 1996 he became Commandant of the Royal College of Defence Studies and in 1998 he was appointed Quartermaster-General to the Forces. He was appointed a Knight Commander of the Order of the Bath in the 1999 New Year Honours and then retired in 2000.
Document 8: Saint Barthélemy: As the terrain is generally arid, the hills have mostly poor soil and support only cacti and succulent plants. During the rainy season the area turns green with vegetation and grass. The eastern part of the island is greener as it receives more rainfall. A 1994 survey has revealed several hundred indigenous species of plants including the naturalized varieties of flora; some growing in irrigated areas while the dry areas are dominated by the cacti variety. Sea grapes and palm trees are a common sight with mangroves and shrubs surviving in the saline coastal swamps. Coconut palm was brought to the island from the Pacific islands. Important plants noted on the island are:
Document 9: Saint Barthélemy: Other trees of note include the royal palm, sea grape trees in the form of shrubs on the beaches and as 5 to 7 m trees in the interior areas of the island, aloe or aloe vera (brought from the Mediterranean), the night blooming cereus, mamillaria nivosa, yellow prickly pear or barbary fig which was planted as barbed wire defences against invading British army in 1773, Mexican cactus, stapelia gigantea, golden trumpet or yellow bell which was originally from South America, bougainvillea and others.
Document 10: 3rd The King's Own Hussars: The 3rd (The King's Own) Hussars was a cavalry regiment of the British Army, first raised in 1685. It saw service for three centuries, including the First World War and the Second World War, before being amalgamated with the 7th Queen's Own Hussars, to form the Queen's Own Hussars in November 1958.
Document 11: Queen's Own Hussars: The Queen's Own Hussars, normally referred to by the abbreviation QOH, was a cavalry regiment of the British Army, formed from the amalgamation of the 3rd The King's Own Hussars and the 7th Queen's Own Hussars at Candahar Barracks, Tidworth in 1958. The regiment served in Aden and Northern Ireland and as part of the British Army of the Rhine. The regiment was amalgamated with the Queen's Royal Irish Hussars to form the Queen's Royal Hussars on 1 September 1993.
Document 12: Welsh Border Mounted Brigade: The Welsh Border Mounted Brigade was a formation of the Territorial Force of the British Army, organised in 1908. After home defence service, it was posted to Egypt where it was absorbed into the 4th Dismounted Brigade in March 1916.
Document 13: Blues and Royals: The Blues and Royals (Royal Horse Guards and 1st Dragoons) (RHG/D) is a cavalry regiment of the British Army, part of the Household Cavalry. The Colonel-in-Chief is Queen Elizabeth II and the Colonel of the Regiment is Anne, Princess Royal. It is the second-most senior regiment in the British Army.
Document 14: Legends of the coco de mer: Nut and tree of the coco de mer, a rare species of palm tree native to the Seychelles archipelago in the Indian Ocean, is the subject of various legends and lore. Coco de mer is endemic to the Seychelles islands of Praslin and Curieuse. Before the Seychelles were discovered and settled, nuts of this species were sometimes carried by the ocean currents to distant shores, such as those of the Maldives, where the tree was unknown. These floating nuts did not germinate. The exceptional size and suggestive form of the nut, the circumstances of its discovery, and some unusual qualities of the trees have given rise to several legends.
Document 15: Saint Barthélemy: Saint-Barthélemy has a marine nature reserve, known as the Reserve Naturelle that covers 1.200 ha, and is divided into 5 zones all around the island to form a network of protected areas. The Reserve includes the bays of Grand Cul de Sac, Colombier, Marigot, Petit Cul de Sac, Petite Anse as well as waters around offshore rocks such as Les Gross Islets, Pain de Sucre, Tortue and Forchue. The Reserve is designed to protect the islands coral reefs, seagrass and endangered marine species including sea turtles. The Reserve has two levels of protection, the yellow zones of protection where certain non-extractive activities, like snorkeling and boating, are allowed and the red zones of high protection where most activities including SCUBA are restricted in order to protect or recover marine life. Anchoring is prohibited in the Reserve and mooring buoys are in place in some of the protected bays like Colombier
ground_truth: 1773
sub_queries: Tidworth Camp >> operator Answer: British Army
When did British Army invade the island? Answer: 1773