Read this: In 1816, the United Kingdom annexed the islands, ruling them from the Cape Colony in South Africa. This is reported to have primarily been a measure to ensure that the French would be unable to use the islands as a base for a rescue operation to free Napoleon Bonaparte from his prison on Saint Helena. The occupation also prevented the United States from using Tristan da Cunha as a cruiser base, as it had during the War of 1812.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): When were the islands annexed by Napoleon Bonaparte?
unanswerable