Because Hanumanji is portrayed on the banner of Arjuna, it is understood that Arjuna meditated on him during the battle, even though Lord Krishna Himself is his chariot driver and tactical advisor in the battle of Kuruksetra. This underscores the importance of sadhu in the three-way check and balances system known as ‘guru, sastra and sadhu. Lord Krishna in this case is the guru and Hanuman or Vajrangaji represents the sadhus. In the introduction to the Srimad Bhagavatam, Srila Prabhupada writes in the Introduction to the Srimad Bhagavatam: “Arjuna was also a Vaisnava devotee of Lord Krsna, and he fought valiantly for the satisfaction of the Lord. Similarly, Vajrangaji, or Hanuman, was also a devotee of Lord Rama, and he gave lessons to the non-devotee party of Ravana.” In London on 17 July 1973 he said this during a lecture on the Bhagavad-gita 1.20, “Just like nowadays also, every nation has different types of flags, so Arjuna also had his flag….Dhvajah means the flag. The flag was on the top of his chariot. And it was marked with Hanuman, Vajrangaji….Hanuman, who fought for Lord Ramacandra…. He is fighting for Krsna. So he is also following the footsteps of Vajrangaji.”