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In page Suez Crisis:

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In October 1951, the Egyptian government unilaterally abrogated the Anglo-Egyptian Treaty of 1936, the terms of which granted Britain a lease on the Suez base for 20 more years.[2] Britain refused to withdraw from Suez, relying upon its treaty rights, as well as the presence of the Suez garrison. The price of such action was an escalation in violent hostility towards Britain and its troops in Egypt, which the Egyptian authorities did little to curb.[citation needed]