Valmiki Ramayana Kishkindha Kanda Sarga 12 Shloka 17

ततः then, वालिसुग्रीवयोः for Vali and Sugriva, बुधाङ्गारकयोः between Budha (Mercury) and Angaraka (Mars), ग्रहयोरिव like the planets, सुतुमुलम् tumultous, युद्धम् war, अभूत् took place.

Then a tumultuous combat took place between Vali and Sugriva who looked like the planets Mercury and Mars.