Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
युद्धकाले समुत्पन्ने यस्य नाम ह्युदाहृतम् ।मात्रारूढं तु यन्नाम आदित्यो गुरुरेव च ॥ ४ ॥
In the full Agni Purana this is chapter 131, verse 4.
When war comes up, look at the name spoken for the person. Say the name rests on a vowel mark. And the Sun and Jupiter stand there too.
Simple meaning: When war begins, look at the person's name and where it sits in the wheel. The sentence ends in the next verse.
जयस्तस्य सदाकालं सङ्ग्रामे चैव भीषणे ।
A good name sitting place brings victory. A short name means the warrior dies in battle.
प्रथमो दीर्घ आदिस्थो द्वितीयो मध्ये अन्तकः(?) ।
A long vowel at the start and others in the middle are read for victory. The rule is not clear.
पुनश्चान्ते यदा चाऽऽदौ स्वरारूढं तु दृश्यते ।
The verse says the short-named warrior dies in battle and the long-named one wins.