In 1908 he became secretary of the historical section of the committee for imperial defence.

The origins of imperial defence: an inaugural lecture delivered before the University of Oxford on 8 June 1955 (1955).

The United Australia Party government emphasised cooperation with Britain in "a policy of imperial defence."

In particular, O'Connor points to Frere as a leading thinker on imperial defence.

'Australia, the Trent Crisis of 1861 and the strategy of imperial defence' in Stevens, D. & Reeve, J., eds.

The colonies would increase their influence while Britain would be able to share the costs of imperial defence.

He proposed that the conference create an Imperial Council that would assume responsibility for the general shape of imperial defence and foreign policy.

The burden of imperial defence and the continental commitment reconsidered, Historical Journal, vol.

The UAP government emphasised cooperation with Britain in "a policy of imperial defence."

While New Zealand proposed that each colony provide a special force for imperial defence in the case of war, Canada and Australia both believed this idea undermined self-government.