The following verses from the Srimad-Bhagavatam (2.7.23-25) are from the chapter entitled "Scheduled Incarnations," which summarizes the appearance and activities of more than twenty incarnations of the Supreme Lord. Lord Ramacandra appeared in the Treta-yuga, more than two million years ago.
Due to His causeless mercy upon all living entities within the universe, the Supreme Personality of Godhead, along with His plenary extensions, appeared in the family of Maharaja Iksvaku as the Lord of His internal potency, Sita. Under the order of His father, Maharaja Dasaratha, [Lord Ramacandra] entered the forest and lived there for considerable years with His wife and younger brother. Ravana, who was very materially powerful, with ten heads on his shoulders, committed a great offense against Him and was thus ultimately vanquished.
The Personality of Godhead Ramacandra, being aggrieved for His distant intimate friend [Sita], glanced over the city of the enemy Ravana with red-hot eyes like those of Hara [who wanted to burn the kingdom of heaven]. The great ocean, trembling in fear, gave Him His way because its family members, the aquatics like the sharks, snakes, and crocodiles, were being burnt by the heat of the angry red-hot eyes of the Lord.
When Ravana was engaged in the battle, the trunk of the elephant which carried the king of heaven, Indra, broke in pieces, having collided with the chest of Ravana, and the scattered broken parts illuminated all directions. Ravana therefore felt proud of his prowess and began to loiter in the midst of the fighting soldiers, thinking himself the conqueror of all directions. But his laughter, overtaken by joy, along with his very air of life, suddenly ceased with the tingling sound of the bow of Ramacandra, the Personality of Godhead.