Then, seated in their great chariot, harnessed to white horses, Madhava (Sri Krishna) and the son of Pandu (Arjuna) blew their divine conches.

Arjuna Vishaada Yoga

Chapter 1, Verse 14

tataḥ śvetair-hayair-yukte 

mahati syandane sthitau 

mādhavaḥ pāṇḍavaścaiva 

divyau śankhau pradadhmatuḥ

Then, seated in their great chariot, harnessed to white horses, Madhava (Sri Krishna) and the son of Pandu (Arjuna) blew their divine conches.

Sri Krishna sat in his chariot holding the reins, controlling the five horses. When the Lord perceives that one is making an effort to change, He is the controller of all. Pāndavaścaiva: Arjuna was seated with Him in the chariot and they blew their divine conches. This denotes that when one shows interest in changing, the Lord Himself gives strength, power, energy and faith to that person who is willing to change. He gives one power to control the senses: the five horses pulling the chariot represents the five senses. Later on Krishna will explain that to control the mind, one must control the senses. To control the mind is very difficult until you have learned to control the senses. If you control the senses, it's very easy to control the mind.

Bhagavad Gita