Shloka 9
धर्म्यविजय-नियमाः
Rules for Dharmic Victory in Kṣatriya Engagement
स चेन्निकृत्या युद्धयेत निकृत्या प्रतियोधयेत् । अथ चेद् धर्मतो युद्धयेद् धर्मेणैव निवारयेत्
sa cen nikṛtyā yudhyeta nikṛtyā pratiyodhayet | atha ced dharmato yudhyed dharmeṇaiva nivārayet ||
毗湿摩说：“若敌以诡计而战，当以诡计应之；若敌依达摩而战，则当以达摩制之，切不可用不义之法。”
भीष्म उवाच
Educational Q&A
Bhishma teaches a conditional ethic of warfare: answer deceit with deceit if necessary, but when the opponent is righteous, respond only with righteous means. Dharma is not to be abandoned against a dharmic adversary.
In the Shanti Parva’s instruction on kingship and conduct, Bhishma lays down a rule for how a warrior or ruler should respond to an enemy’s mode of fighting—distinguishing between treacherous and dharmic combat and prescribing an appropriate, ethically bounded response.