攻其所不戒 gōng qí suǒ bù jiè

gōng qí suǒ bù jiè phrase attack [the enemy's] unguarded locations
Domain: Literary Chinese 文言文
Notes: Quote: from the Warring States period text 孫子兵法 “Art of War” by Sunzi, section 11 (Amies 2021 tr.; see also tr. by Giles 1910, p. 121)