The Rakshasas Grahas (spirits) that deliver different divisions of the army the commands (of Skanda) that are implicitly obeyed by Indra an the other celestials went in front of the army as standard-bearers.
तस्य कुर्वन्ति वचनं सेन्द्रा देवाश्चमूमुखे। गृहीत्वा तु पताकां वै यात्यचे राक्षसो ग्रहः॥