HARE KRISHNA
The Supreme Lord, Bhagwan Shri Ramji had used Gandharvastra 4 times in valmiki Ramayana
- Lord Rama used Gandharvastra to kill army of Khara and Dushana
Those demons have resurfaced from all around pressurising Raghava in high dudgeon. On seeing the reappearance of demons from everywhere, with whom all the directions and inter-directions are fully filled, and who are storming torrents of arrows, then that exceptionally forceful Rama made a thunderous sound and launched an extremely blazing missile among the gather of demons, called gandharva missile.
~valmiki Ramayana Aranya Kanda Sarga 26
- Lord Rama destroyed Maya missile of Ravan using Gandharvastra.
The immensely radiant one resorted to another terrible weapon that had been fashioned by Maya. Ravana released this terrible weapon towards Raghava. From the bow, blazing spears, clubs and maces, with essence as hard as the vajra, emerged in all the directions. There were bludgeons and deceptive nooses, blazing like thunder. Many kinds of sharp weapons descended, like the wind at the end of a yuga. The prosperous Raghava was supreme among those who knew about weapons. The immensely radiant one destroyed that weapon with the supreme gandharva weapon.
~valmiki Ramayana Yuddha Kanda Sarga 100
- Lord Rama killed thousands of mountain sized demons of Ravan using Gandharvastra.
Having been thrown into confusion by the great mystic missile presided over by the Gandharvas, the celestial musicians; presided over by the Gandharvas, the celestial musicians; those demons were unable to see Rama, even when he was scorching away their army.Those demons for their part saw thousands of Rama's in the battle-field, while at other times, they saw only one Rama in that great battle.
~valmiki Ramayana Yuddha Kanda Sarga 93
- Lord Rama also used Gandharvastra to counter the Gandharvastra fired by loser Ravan
Raghava was supreme in the knowledge of weapons. He destroyed the gandharvastra of the king of the rakshasas with his gandharvastra, divine weapons with his divine weapons. Ravana, the king of demons was very much enraged and again released another extra-ordinarily terrific missile presided over by demons. Seeing those serpents rushing towards him in the battle-field, Rama released the terrific and dangerous missile presided over by Garuda the eagle (an enemy of serpents).
~valmiki Ramayana Yuddha Kanda Sarga 102