Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
कोटमध्ये ग्रहाः सौम्या यदा ऋक्षान्विताः पुनः ।जयं मध्यस्थितानां तु भङ्गमागामिनो विदुः
In the full Agni Purana this is chapter 128, verse 11.
When good planets are in the middle of the Kota and also have the nakshatras (stars), the ones inside win. They say defeat comes to the one who arrives.
Simple meaning: With good planets and nakshatras in the middle, those inside win. The one who comes from outside is beaten.
प्रवेशभे प्रवेष्टव्यं निर्गमभे च निर्गमे(च्छे)त् ।
Enter the fort in the entering nakshatra, and leave in the leaving one. Venus, Mercury and Mars matter here.
तदा भङ्गं विजानीयाज्जयमागन्तुकस्य च ।
Then defeat comes, and the outsider wins. Starting battle in the four entering nakshatras brings the fort down.
नाडीयं प्रथमा चान्या याम्यं मृगशिरस्तथा ।
A row of nakshatras is named: Bharani, Mrigashira, Pushya, Purva Phalguni, Chitra, Anuradha, Purva Ashadha, Dhanishtha.