If I do so

'I am unable to desert Duryodhana in battle! If I do so, it would be a  

1. dishonourable, 
2. cruel, and 
3. ungrateful act. 

If, yielding to thy wishes, 

I make peace with Yudhishthira, people will say that I am afraid of the white-steeded Arjuna. 
Having vanquished Arjuna with Kesava, therefore in battle I will subsequently make peace with Dharma's son.'

http://www.sacred-texts.com/hin/m12/m12a001.htm