Arthashastra
सदुन्दुभिम् उल्कां च परस्य नक्षत्रे दर्शयेयुः ॥
They should not only attribute the contrary to his enemy, but also show to the enemy's people the shower of firebrand (ulká) with the noise of drums (from the sky) on the day of the birth-star of the enemy.
english translation
sadundubhim ulkAM ca parasya nakSatre darzayeyuH ॥
hk transliteration by Sanscript