Extract from my BOOK -
1.49. GITA - ONE QUESTION - ONE ANSWER
Drutharashtra - the blind king asks
Sanjaya, who is a common man with a vision,
about the war and what is happening.
dharma kshethre kurukshethre
kima kurvathi sanjaya
For this question in the first sloka in Bhagvad Gita
the answer is in the last sloka given by Sanjaya
As where the physical strength of Arjuna
and the mental support of
the success will be.
Thus goes the sloka:
yathra yogeswara krishno
yathra partho dhanurdharaha
thathra srivijayo bhoothihi