Lord Krishna tells Arjun and all of us in The Gita that fighting is not about winning but about doing your duty. In His words:
You are lucky to have a chance to fight in
For your duty will take you to God.
And if you do not fight,
you will be giving up your duty.
Giving up duty is a sin.
The Gita, Chapter 2, Verses 32, 33
Of course as in many texts, the war and fight is both real and symbolic. It is the struggle between good and evil. Our enlightenment will determine whether or not we are on the side of goodness.
Although we clearly seek to win, the fight matters more than the outcome. God explains:
But if you fight,
You will either go to heaven or win victory.
So, Arjun arise.
Make up your mind to fight.
Fight and do not worry about how the war turns out.
Do not care if you win or lose.
The Gita, Chapter 2, Verses 37, 38
It is only by focusing on our actions rather than on their results that we fulfill our obligations to ourselves, to mankind and to worlds.
See The Gita, A New Translation of Hindu Sacred Scripture, by Irina Gajjar.