Valmiki Ramayana Yuddha Kanda Sarga 98 Shloka 19

गदापरिघहस्तौ carrying a mace and an iron bar in their hands, वीरौ heroes, गोवृषप्रख्यौ like two bulls, तौ both, सविद्युतौ charged with lightning, घनाविव like clouds, नर्दन्तौ roaring, युधि in the battlefield, समीयतुः came together

Both the heroes, Mahodara and Sugriva like two bulls holding mace and iron bar respectively, like clouds charged with lightning came roaring in the battlefield.