Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Travel Muhurta
यात्रामण्डलचिन्ता
पार्ष्णिग्राहमुपायैश्च शमयेच्च तथा स्वकम् ।मित्रेण शत्रोरुच्छेदं प्रशंसन्ति पुरातनाः ॥ २३ ॥
In the full Agni Purana this is chapter 233, verse 23.
Calm the Parshnigraha (the enemy at the rear) by the means, and calm your own side too. The old teachers praise cutting down the enemy through a friend.
Simple meaning: Calm the enemy at the rear by the right means. Using a friend to cut down an enemy is praised.
मित्रं च शत्रुतामेति सामन्तत्वादनन्तरम् ।
A friend can turn into an enemy. A king who can do it alone should cut down the enemy himself.
प्रतापवृद्धौ तेनापि नामत्राज्जायते भयम् ।
When the king wins by his own strength, enemies no longer frighten him. He should keep people calm and trusting.
जिगीषुर्धर्मविजयी तथा लोकं वशं नयेत् ॥ २६ ॥
A king who wins by dharma should win the people over.