Ramayana
सा सेना शीघ्रमागच्छच्छ्रुत्वा शत्रुघ्नशासनम् । निवेशनं च शत्रुघ्नः श्रावणेन समारभत् ॥ 7-70-8 ॥
That army came swiftly on hearing Shatrughna's command, and Shatrughna began the founding of the settlement in the month of Shravana.
english translation