सञ्जय
In plain words
and then, O lord of the earth, spoke these words to Hrishikesha. Arjuna said: O Achyuta, place my chariot between the two armies.
Word for word
To Hṛṣīkeśa then [he] spoke these words, O lord of the earth: Between both armies station my chariot, O Acyuta.
हृषीकेशं तदा वाक्यमिदमाह महीपतेसेनयोरुभयोर्मध्ये रथं स्थापय मेऽच्युत