Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Travel Muhurta
यात्रामण्डलचिन्ता
एतत्पुरस्तात्कथितं पश्चादपि निबोध मे ।पार्ष्णिग्राहस्ततः पश्चात्ततस्त्वाक्रन्द उच्यते ॥ १६ ॥
In the full Agni Purana this is chapter 233, verse 16.
This was told about the front. Now hear about the back too. Behind comes the Parshnigraha (the enemy at the rear). After him the Akranda (the ally at the rear) is named.
Simple meaning: Now hear about the kings behind: first the enemy at the rear, then the ally at the rear.
आसारस्तु ततोऽन्यः स्यादाक्रन्दासार उच्यते ।
Behind the king come the rear enemy's helper and the rear ally's helper.
नात्रापि निश्चयः शक्यो वक्तुं मनुजपुंगव ।
A king who can hold back or help both sides is called the middle king.
निग्रहानुग्रहेऽशक्तः सर्वेषामपि यो भवेत् ।
A strong king who does not hold back or help anyone is called the neutral king.