In June 1940, the entire population of Alderney, about 1,500 residents, were evacuated. Most went on the official evacuation boats sent from mainland Britain. Some, however, decided to make their own way, mostly via Guernsey, but due to the impending occupation many found themselves unable to leave and were forced to stay on Guernsey for the duration of the war. A few Alderney people elected not to leave Alderney with the general evacuation. However, boats from Guernsey came and collected them before the German Army arrived, on the basis that it was best for their personal safety. During the Second World War, the Channel Islands were the only part of the British Isles that was occupied by Germany, although other parts of the Empire were occupied by the Axis powers.