Please answer the following question: I know that the answer to the question "The wounded were what in the major centre?" is in "Southampton has been used for military embarkation, including during 18th-century wars with the French, the Crimean war, and the Boer War. Southampton was designated No. 1 Military Embarkation port during the Great War and became a major centre for treating the returning wounded and POWs. It was also central to the preparations for the Invasion of Europe in 1944.". Can you tell me what it is?
A:
treating