अपर्याप्तं तदस्माकं बलं भीष्माभिरक्षितम्। पर्याप्तं त्विदमेतेषां बलं भीमाभिरक्षितम् ॥

aparyāptaṁ tadasmākaṁ balaṁ bhīṣhmābhirakṣhitam paryāptaṁ tvidameteṣhāṁ balaṁ bhīmābhirakṣhitam

Yet insufficient seems this army of ours, though marshalled by Bhîshma, while that army of theirs seems sufficient, though marshalled by Bhîma;

In plain words: Duryodhana admits a worry. His army, led by the old warrior Bhishma, seems not strong enough, while the Pandava army, guarded by Bhima, seems strong enough.