one who understands the intricacies of military art — SB 3.1.31plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 3.1.31

O Uddhava, does Yuyudhāna fare well? He learned the intricacies of the military art from Arjuna and attained the transcendental destination which is very difficult to reach even for great renouncers.

confidential — SB 1.7.44plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 1.7.44

It was by Droṇācārya's mercy that you learned the military art of throwing arrows and the confidential art of controlling weapons.