 He sat on the executive committee of the British Empire League and advocated closer economic ties between Canada and Britain, while continuing to oppose Imperial Federation and requests for Canada to make a direct contribution to imperial defense costs (though he supported Borden's decision to voluntarily make an emergency contribution of dreadnoughts to the Royal Navy in 1912).In his retirement, Tupper wrote his memoirs, entitled "Recollections of Sixty Years in Canada", which were published in 1914.He also gave a series of interviews to journalist W. A. Harkin which formed the basis of a second book published in 1914, entitled "Political Reminiscences of the Right Honourable Sir Charles Tupper".