Question: When did the organization where George Lyon serve invade the island?

full_context: Document 1: Bob Lyon: Bob Lyon, an American politician, is a former Kansas State Senator from the city of Winchester. A civil engineer, Lyon is a graduate of the University of Virginia and George Washington University.
Document 2: 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 3: George Lawrence (politician): George Lawrence (March 21, 1857 – 1924) was a politician in Manitoba, Canada. He served in the Legislative Assembly of Manitoba from 1899 to 1915 as a member of the Conservative Party, and was a cabinet minister in the government of Rodmond Roblin.
Document 4: Cape Lyon: Cape Lyon is located in the Northwest Territories, Canada within Darnley Bay, from Clapperton Island. The cape was named in honor of Captain George Francis Lyon, R.N. by John Franklin. The topography presents with gently swelling eminences, covered with a grassy sward, and intersected by several narrow ridges of rocks, rising about . The coast ridges form high cliffs. Clay-slate and limestone lie in nearly horizontal strata beneath them. The view inland terminates with the Melville Range.
Document 5: 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 6: Sir George Bowyer, 6th Baronet: Sir George Bowyer, 6th Baronet and 2nd Baronet, KStJ, GCSG, KCPO (3 March 1783 – 1 July 1860), was a British politician. He sat in the House of Commons in two periods between 1807 and 1818, first as a Tory and then as a Whig.
Document 7: George Lyon (Canadian politician): George Lyon (1790 – 26 March 1851) was a captain in the British Army and a Canadian businessman and politician.
Document 8: 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 9: George Britton (politician): George Bryant Britton (1863 – 11 July 1929) was an English boot and shoe manufacturer and Liberal Party Member of Parliament.
Document 10: John Janvrin: John Janvrin (29 August 1762 – 22 December 1835) was a businessman, politician, militia officer, and justice of the peace in Canada.
Document 11: Robert Lyon (politician): His father, George Lyon, was a Scottish captain in the British army, who settled in Richmond, Ontario. His oldest brother was George Byron Lyon, another mayor of Ottawa.
Document 12: 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 13: 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
Document 14: 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 15: 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.
ground_truth: 1773
sub_queries: George Lyon >> military branch Answer: British Army
When did British Army invade the island? Answer: 1773