Brihat Samhita
पलालधूमसञ्चयस्थितौपमा बलाहकाः । बलान्यरूक्षमूर्तयो विवर्धयन्ति भूभृताम् ॥ ३०-२८ ॥
If at sunrise or sunset clouds should resemble columns of smoke of burnt straw and be of agreeable appearance, the army will gain in strength.
english translation
palAladhUmasaJcayasthitaupamA balAhakAH । balAnyarUkSamUrtayo vivardhayanti bhUbhRtAm ॥ 30-28 ॥
hk transliteration by Sanscript