Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
भुङ्क्ते चतस्रो नाड्य(डी)स्तु राहुः पृष्ठे जयो रणे ।अग्रतो मृत्युमाप्नोति तिथिराहुं वदामि ते
In the full Agni Purana this is chapter 125, verse 35.
Rahu takes four ghatikas (24-minute units) in each place. With Rahu behind, there is victory in battle. With Rahu in front, one meets death. I will tell you about the Rahu of the tithi (moon day).
Simple meaning: Rahu behind brings victory in battle and Rahu in front brings death.
आग्नेयादि शिवान्तं च पूर्णिमामादितः प्रिये ।
From the full moon on, Rahu moves through the directions, and his look brings victory.
ऐशान्याग्नेयनैर्ऋत्यवायव्ये फणिराहुकः ।
Snake Rahu sits in the corner directions. Death comes where the Sun is in front.
तृतीया कृष्णपक्षे तु सप्तमी दशमी तथा ।
Moon days named: 3rd, 7th, 10th, 14th of the dark half; 4th and 11th of the bright half.