Bhagavad Gita Chapter 2.31
sva-dharmam api cāvekṣya
na vikampitum arhasi
dharmyād dhi yuddhāc chreyo ‘nyat
kṣatriyasya na vidyate
Considering your specific duty as a kshatriya, you should know that there is no better engagement for you than fighting on religious principles; and so there is no need for hesitation.