In plain words
All these sons of Dhritarashtra, together with the hosts of kings, Bhishma, Drona, the charioteer’s son, and our foremost warriors as well,
Word for word
And these sons of Dhṛtarāṣṭra, all of them, together with the hosts of the rulers of the earth, Bhīṣma, Droṇa and that son of a charioteer too, together with even our own chief warriors, [enter] You,
The commentators
Bhagavadgītābhāṣyam
येभ्यो मम पराजयाशङ्का या आसीत् सा च अपगता । यतः —
अमी च त्वां धृतराष्ट्रस्य पुत्राः दुर्योधनप्रभृतयः — ‘त्वरमाणाः विशन्ति’ इति व्यवहितेन सम्बन्धः — सर्वे सहैव सहिताः अवनिपालसङ्घैः अवनिं पृथ्वीं पालयन्तीति अवनिपालाः तेषां सङ्घैः, किञ्च भीष्मो द्रोणः सूतपुत्रः कर्णः तथा असौ सह अस्मदीयैरपि धृष्टद्युम्नप्रभृतिभिः योधमुख्यैः योधानां मुख्यैः प्रधानैः सह ॥ २६ ॥
In plain words
That fear of losing to these very warriors, the fear I once carried — it is gone now. And here is why —
And here they come — Dhṛtarāṣṭra's sons, Duryodhana and all the rest, rushing to enter you, along with every king who has ever guarded this earth and their whole armies with them. Bhīṣma is there, and Droṇa, and Karṇa the charioteer's son — and even our own people, Dhṛṣṭadyumna and the other great warriors on my own side. All of them, together, entering you.
Close to the Sanskrit
That fear of defeat which I had, from those very ones — that too has departed. Because —
And these, sons of Dhṛtarāṣṭra headed by Duryodhana, into you — 'hastening, they enter': the construction is with the word separated by intervening matter — all of them together, united, with hosts of protectors of the earth — those who protect the earth, thus protectors of the earth — with their hosts; moreover Bhīṣma, Droṇa, the charioteer's son Karṇa, and likewise, he too, together with even our own, headed by Dhṛṣṭadyumna, with the chief warriors, the foremost among warriors, the leading ones, together.