Mahabharata 8.65.44

8.65.44

athāpalāyanta vihāya karṇaṃ tavātmajāḥ kuravaścāvaśiṣṭāḥ |
hatānavākīrya śarakṣatāṃśca lālapyamānāṃstanayānpitṝṃśca || 44 ||

Then that slayer of foes, that bull of Kuru's race, that foremost of heroes, viz., Savyasaci, O king, soon slew in that battle 2,000 foremost of Kuru warriors, with their cars and steeds and drivers, forming the protectors of Karna's car-wheels and wings and his van-guard and rear-guard and who constituted the very pick of Duryodhana's car-force, and who, urged by Duryodhana, had been fighting with great energy. Then thy sons and the Kauravas that were still alive fled away, deserting Karna, and abandoning their dying and wounded, and their wailing sons and sires. Beholding himself abandoned by the terrified Kurus and seeing the space around him empty, Karna felt no agitation, O Bharata, but, on the other hand, rushed at Arjuna, with a cheerful heart.'"