16-character formula, esp. Mao Zedong's mantra on guerrilla warfare:
敵進我退,
敵駐我擾,
敵疲我打,
敵退我追,
敌驻我扰,
敌疲我打,
敌退我追 díjìnwǒtuì,
dízhùwǒrǎo,
dípíwǒdǎ,
dítuìwǒzhuī when the enemy advances we retreat; when the enemy makes camp we harass; when the enemy is exhausted we fight; and when the enemy retreats we pursue