To explain the reasons for washing away a national disgrace and to teach the methods of warfare; used in reference to training soldiers in times of peace to prepare them to fight bravely.

Title of a famous political essay by the Song Dynasty writer [[苏轼|蘇軾|su1 shi4]], literal title 'Strategies for Training, Combat, and Defense'. It argues that a ruler must maintain military readiness and a sense of crisis even during times of peace to ensure national security.