Mahabharata 6.15.31
के पुरस्तादवर्तन्त रक्षन्तो भीष्ममन्तिकेकेऽरक्षन्नुत्तरं चक्रं वीरा वीरस्य युध्यतः
ke purastādavartanta rakṣanto bhīṣmamantikeke'rakṣannuttaraṃ cakraṃ vīrā vīrasya yudhyataḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book