In the Shrimad Bhagwad Geeta, Chapter 1, when Duryodhana describes his warheads to Dronacharya, he uses everybody's name but he refers to Kripacharya as 'Samitinjaya'. Why does he use Samitinjaya (it means sangramvijayi, 'the victorious in war'), when Bhishma Pitamahaa is also undefeated and why does he use that word specifically for Kripacharya, and no alankars for other warheads?
भवान् भीष्मश् च कर्णश् च कृपश् च समितिञ्जयः
अश्वत्थामा विकर्णश् च स्औमदत्तिस् तथ्ऐव च १.८
bhavān bhīṣmaś ca karṇaś ca kṛpaś ca samitiñjayaḥ
aśvatthāmā vikarṇaś ca saumadattis tathaiva ca 1.8