Bhagavad Gita Chapter 1 Sloka 11 (1.11)

ಅಯನೇಷು ಚ ಸರ್ವೇಷು ಯಥಾಭಾಗಮವಸ್ಥಿತಾಃ ।
ಭೀಷ್ಮಮೇವಾಭಿರಕ್ಷಂತು ಭವಂತಃ ಸರ್ವ ಏವ ಹಿ॥೧೧॥
ayaneṣu ca sarveṣu yathābhāgamavasthitāḥ |
bhīṣmamevābhirakṣaṃtu bhavaṃtaḥ sarva eva hi||11||
Sloka 1:11
Gist of the sloka:
Distributing yourselves at all appropriate corners, protect Bheeshmacharya at all times.
Explanation:
Bheeshmacharya had sacrificed his own inner thoughts of supporting Pandavas and under the obligation to the throne of the Kingdom, was willing to fight for Kauravas. He also undertook the onerous responsibility to fight against his own grandsons. He was also resolute to fight with integrity and with determination. All of this, against his own will and belief.
It would have certainly hurt such a brave and determined warrior to see his grandson addressing Dronacharya in a tone indicating he neither trusted nor believed the aged Bheeshmacharya would do the right thing and fight with his full strength.
Even at his advanced age of nearly 700 years, Bheeshmacharya was a powerful determined warrior which even Karna acknowledged. People refused to fight Bheeshmacharya as they all knew they would meet their death instantly. Such was the fearsomeness of Bheeshmacharya.