In 1969, Colonel Gaddafi led a coup in Libya, took control of the country and proceeded, after negotiations, to close down British military installations located at El Adem and Tobruk, and American installations located near Tripoli. This presented the UK with a problem, as there were no areas large enough to allow the British Army to undertake large-scale armoured warfare exercises in Europe. In 1971 a 10-year lease was signed between the British and Canadian Governments that authorized battle group training to take place in the Suffield area by the British Army. In January 1972, the British Army Training Unit Suffield was formally established. In July, the first live rounds were fired by the 4th Royal Tank Regiment Battle Group. In 1981, the lease for Suffield was extended, and in 1991, the lease was again extended. In 2006, on the expiration of this lease, the British and Canadian governments concluded an agreement that would allow British forces to maintain their training practices in Canada indefinitely.