October 1925

The principal treaty concluded at Locarno was the "Rhineland Pact" between Germany, France, Belgium, the United Kingdom, and Italy. The first three signatories undertook not to attack each other, with the latter two acting as guarantors. In the event of aggression by any of the first three states against another, all other parties were to assist the country under attack.

Germany also agreed to sign arbitration conventions with France and Belgium and arbitration treaties with Poland and Czechoslovakia, undertaking to refer disputes to an arbitration tribunal or to the Permanent Court of International Justice.

France signed further treaties with Poland and Czechoslovakia, pledging mutual assistance in the event of conflict with Germany. These essentially reaffirmed existing treaties of alliance concluded by France with Poland on 19 February 1921 and with Czechoslovakia on 25 January 1924

effects:

The Locarno Treaties were regarded as the keystone of the improved western European diplomatic climate of 1924-1930, introducing a hope for international peace, typically called the "spirit of Locarno". This spirit was seen in Germany's admission to the League of Nations, the international organization established under the Versailles treaty to promote world peace and co-operation, and in the subsequent withdrawal (completed in June 1930) of Allied troops from Germany's western Rhineland.