Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Omens
शकुनानि
वृषोऽश्वः कुञ्जरो वाऽपि रिपुसैन्यगतोऽशुभः ।खण्डमेघातिवृष्ट्या तु सेना नाशमवाप्नुयात् ॥ ३५ ॥
In the full Agni Purana this is chapter 232, verse 35.
A bull, a horse or an elephant gone into the enemy's army is bad. By too much rain from broken clouds an army will be ruined.
Simple meaning: A bull, horse or elephant joining the enemy army is bad. Heavy rain from broken clouds can ruin an army.
वामं दक्षिणपादेन पादमाक्रमते शुभः ।
An elephant stepping on its left foot with the right, or wiping its right tusk, is good.
प्रतिकूलग्रहर्क्षात्तु तथा संमुखमारुतात् ।
A falling umbrella with a bad planet or star, or a headwind, brings fear in a journey or battle.
हृष्टा नराश्चानुलोमा ग्रहा वै जयलक्षणम् ।
Happy men and planets moving rightly mean victory. East, west, north-east and north are good directions.