PEACE, n. In international affairs, a period of cheating between two periods of fighting.

Ambrose Bierce (1842-1914?) American writer and journalist

“Peace,” The Devil’s Dictionary (1911)
    (Source)

Originally published in the "Cynic's Word Book" column in the New York American (1904-12-26), and the "Cynic's Dictionary" column in the San Francisco Examiner (1905-01-03).