Since the combined celestials and the Asuras headed by Indra are incapable of defeating that foremost of the wielders of weapons, having Krishna for his ally.
यं हि कृष्णेन सहितं सर्वशस्त्रभृतां वरम्। जेतुं न शक्ताः सहिताः सेन्द्रा अपि सुरासुराः॥