In the months following signature of the Anglo-Irish treaty the British government was particularly concerned with the transfer of power to a legally constituted government and parliament in Dublin which would be committed to implementation of the treaty and supported by an electoral majority This goal was, however, subject to an overriding consideration: preservation, at almost any cost, of the agreement embodied in the treaty The Collins-de Valera pact brought these considerations into conflict. It is the purpose of this paper to examine why the British government, and Winston Churchill in particular, objected so strenuously to the pact and why, despite these objections, an election under the terms of the pact was permitted.