TASK DEFINITION: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
PROBLEM: Passage: Ward Thomas joined RAF Bomber Command in 1941 and trained as a navigator and pilot in South Africa. He joined 100 Squadron as a Lancaster pilot and was later moved to 550 Squadron stationed in Grimsby. He flew 36 trips over France and Germany over the course of the war, including taking part in the Nuremberg raid of March 1944 during which Bomber Command suffered its heaviest loses. He was awarded the Croix de Guerre for his involvement in bombing raids on the German Panzer training camp at Mailly-le-Camp in advance of the Normandy landings in June 1944. He also received the DFC "for utmost fortitude, courage and devotion to duty in air operations" during the War. By the time he left the RAF Ward Thomas had achieved the rank of flight lieutenant.
 Link Information: The Avro Lancaster is a British four-engined Second World War heavy bomber. Answer: Avro 

SOLUTION: Who was the manufacturer of the planes Thomas flew when he joined 100 Squadron?

PROBLEM: Passage: In 1857, he enlisted as a private in Company K of the 7th Regiment of the New York National Guard, and was attached to the staff of Brig. Gen. William Hall. At the start of the American Civil War, Pierson helped organize the 1st New York Volunteer Infantry Regiment, and was appointed captain in May 1861. He was promoted several times and assumed command of the regiment on October 9, 1862, with the rank of colonel. Attached to the 3rd Corps, Army of the Potomac, he led the 1st New York in actions at the Seven Days Battles, Second Manassas and the Battle of Fredericksburg. After the Battle of Chancellorsville in May 1863, Colonel Pierson was honorably discharged and mustered out on May 25, 1863. For distinguished service, he was brevetted brigadier general of the United States Volunteers for "gallant and meritorious services."
 Link Information: The Seven Days Battles were a series of seven battles over seven days from June 25 to July 1, 1862 Answer: Seven Days Battles

SOLUTION: Pierson fought several battles with the 1st New York - which one happened first?

PROBLEM: Passage: The Colony of Vancouver Island had been created in 1849 to bolster British claims to the whole island and the adjacent Gulf Islands, and to provide a North Pacific home port for the Royal Navy at Esquimalt. By the mid-1850s, the Island Colony's non-indigenous population was around 800 people; a mix of mostly British, French-Canadian, Metis, Hawaiians, but with handfuls of Iroquoians and Cree in the employ of the fur company, and a few Belgian and French Oblate priests (thousands of First Nations died due to the smallpox epidemic). Three years earlier, the Treaty of Washington had established the boundary between British North America and the United States of America west of the Rocky Mountains along the 49th parallel. The mainland area of present-day British Columbia, Canada was an unorganised territory under British sovereignty until 1858. The region was under the de facto administration of the Hudson's Bay Company, and its regional chief executive, James Douglas, who also happened to be Governor of Vancouver Island. The region was informally given the name New Caledonia, after the fur-trading district which covered the central and northern interior of the mainland west of the Rockies.
 Link Information: In November 1839, Douglas was promoted to Chief Factor, the highest possible rank for field service with the HBC.  Answer: 1839

SOLUTION:
When did James Douglas become a regional chief executive of the Hudson's Bay Company?