Gandharva Astra is mentioned in Valmiki’s Ramayana first chapter Bala Kand sarga 27, Shri Rama used the Gandharva Astra to kill and destroys the army of about 10,000 chariots,18,000 elephants, 14000 horses with their riders, and 200,000 ground soldiers with superhuman speed in a matter of three hours.