After his defeat in the Battle of Waterloo in June 1815 and the subsequent occupation of Paris, the Emperor of the French, Napoleon, surrendered to the British and was exiled to St Helena. He arrived on 21 October aboard the 74-gun ship  and resided at the Briars in Jamestown for several months until he was transferred to Longwood House in a more remote part of the island in December. Jamestown was chosen to host a vice admiralty court and a naval base for British efforts to interdict the slave traffic between Africa and the Americas. Captured slave ships were often brought to Jamestown to be sold and their cargos were off-loaded in Rupert's Valley. By the time that the naval station was closed in the 1870s, an estimated 25,000 slaves had been rescued, although about 5,000 died shortly after arrival and were buried in Rupert's Valley. Long lost, their graves were rediscovered in 2006 in conjunction with preliminary digging for the airport. A team of archaeologists arrived in mid-2008 to excavate the graves. Some of the finds from the excavations are on exhibit at the International Slavery Museum in Liverpool, England.