प्रायशश्चाचार्याः परव्यसने यातव्यमित्युपदिशन्ति ॥ कZ_०९.१.४२ ॥
prāyaśaścācāryāḥ paravyasane yātavyam ity upadiśanti
一般而言,诸师教导说:“当敌人陷于困厄(vyasana)时,应当进军。”
Exploit adversary vulnerability: initiate operations when the opponent is distracted, weakened, or administratively stressed.