Bhagavad Gita 18.43
Valor, glory, firmness, skill, generosity, steadiness in battle, and the ability to rule—these constitute the duty of a soldier. They flow from his own nature.
शौर्यं तेजो धृतिर्दाक्ष्यं युद्धे चाप्यपलायनम्।दानमीश्वरभावश्च क्षात्रं कर्म स्वभावजम्॥śauryaṃ tejo dhṛtirdākṣyaṃ yuddhe cāpyapalāyanam|dānamīśvarabhāvaśca kṣātraṃ karma svabhāvajam||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).