In 1765, Captain John Byron explored Saunders Island, which lies 1.5 miles (2.5 km) off the coast of West Falkland. He named the harbour Port Egmont, and claimed this and other islands for Britain, on the grounds of prior discovery. The next year Captain John MacBride established a British settlement at Port Egmont. The British presence in the west continued, until interrupted by Spain (who had acquired the French colony), during the Falkland Crisis from 10 July 1770 to 22 January 1771. Economic pressures led Britain to unilaterally withdraw from many overseas settlements in 1774.