This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: The first overseas deployment of Canadian military forces occurred during the Second Boer War, when several units were raised to serve under British command. Similarly, when the United Kingdom entered into conflict with Germany in the First World War, Canadian troops were called to participate in European theatres. The Canadian Crown-in-Council then decided to send its forces into the Second World War, as well as the Korean War. Question: Under what command did they serve?
British command