Thereupon Madhava (Krishna) and Arjuna (Pandu’s son), positioned in the great chariot yoking white horses, blew their divine conches.
Sanjaya significantly details that Arjuna and Krishna rode a great chariot with white horses, white implying purity and elegance.
When Bheeshma the Great, of Duryodhana’s army, blew his conch, and all others followed with their collective war cries, it was for Dhrishtadyumna commanding Yudhishthira’s army to respond readily. But he wisely kept quiet, a restraint of only the good, virtuous and humble.
When Duryodhana and Arjuna went to Dwaraka to seek help for the impending war, Krishna divided his resources. On one side was he alone without wielding any weapon. On the other side was his army, the famed Narayanee Sena. Arjuna chose Krishna alone, disregarding his huge army.
However, that did not prevent Krishna from blowing readily his conch, which speaks volumes of how the course of events was getting shaped.