Question: When did the military branch Charles Spackman served in invade the island?

full_context: Document 1: 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 2: 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 3: Hugh Colvin: He was 30 years old, and a second Lieutenant in the 9th Battalion, The Cheshire Regiment, British Army during the First World War when the following deed took place for which he was awarded the VC.
Document 4: 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 5: Charles Spackman: He was 26 years old, and a sergeant in the 1st Battalion, Border Regiment, British Army during the First World War when the following deed took place for which he was awarded the VC.
Document 6: Frederick William Dobson: Dobson was 27 years old, and a private in the 2nd Battalion, Coldstream Guards, British Army during the First World War when the following deed at the First Battle of the Aisne took place for which he was awarded the VC.
Document 7: 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 8: Frank Blaker: Born in Kasauli, Punjab, India, Frank Blaker was 24 years old, and a Temporary Major in the Highland Light Infantry, British Army, attached to 3rd Battalion, 9th Gurkha Rifles, in the Indian Army during World War II when the following deed took place for which he was awarded the VC.
Document 9: Hugh McIver: He was 28 years old, and a private in the 2nd Battalion, The Royal Scots (The Lothian Regiment), British Army during the First World War when the following deed took place for which he was awarded the VC.
Document 10: James Youll Turnbull: He was a sergeant in the 17th Battalion (Glasgow Commercials), The Highland Light Infantry, British Army during the Battle of the Somme in First World War. On 1 July 1916, Turnbull was awarded the VC for his actions at Leipzig Salient, Authuille, France, where Turnbull's party captured a post of apparent importance, and defended it "almost single-handed[ly]". Later in the day he was killed while engaged in a bombing counter-attack. He was 32 years old.
Document 11: 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 12: Arthur Henderson (VC): He was 23 years old, and an Acting Captain in the 4th Battalion, The Argyll and Sutherland Highlanders (Princess Louise's), British Army, attached to 2nd Battalion during the First World War. On 23 April 1917 near Fontaine-les-Croisilles, France, he performed the deed for which he was awarded the Victoria Cross. He died the following day.
Document 13: 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 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: Alfred Joseph Richards: Richards was 35 years old, and a sergeant in the 1st Battalion, The Lancashire Fusiliers, British Army during the First World War when the following deed took place for which he was awarded the VC.
ground_truth: 1773
sub_queries: Charles Spackman >> military branch Answer: British Army
When did British Army invade the island? Answer: 1773