While Ravana's ministers, thinking Ravana to be indestructible, advised him to fight Rama, Ravana's brother Vibheeshan advised him to honorably return the chaste Sita to Rama and ask for his forgiveness.
Ravana, blind with arrogance, said, "Mere men and monkeys cannot scare me."
Vibheeshan said, "A kings' duty is to protect its subjects. But you, with your evil actions, will only cause Lanka's destruction. For the sake of your people ask Rama to forgive you."
The enraged Ravana told Vibheeshan to leave his kingdom at once.
With his magical powers, Vibheeshan rose in the air and flew to the place where Rama had encamped. The monkeys thought that he was Ravana, and they got ready to attack him but Bibheeshan assured them that he was a friend.
On meeting Rama, Bibheeshan told him that he would support him in this war against evil. Vigheeshan tool Rama's shelter and became an important adviser in this war.
Knowing him to be a man of virtue, Rama promised to make him the king of Lanka after dethroning Ranana.
Rama prayed before the god of Ocean and sought its advice on how to cross the ocean.
The God of Ocean said, "I cannot dry the water of the ocean to help you. But if you want to cross me, then build a bridge over me. I promise to hold the bridge firmly. Take the help of the monkey chif Nala to build te bridge."
Nala was the son of the God of Construction. Rama asked Nala to make a bridge across the ocean and help them to get to Lanka.
At once thousands of monkeys came to help Nala in construction the bridge. They started gathering tree trunks and rocks with which they would build the bridge. they wrote 'Rama' on each rock. When they threw it in the ocean, it didn't sink.
In just five days, they successfully completed this great task. Before crossing over, all the monkeys shouted, "Glory be to Rama."
When Ravana came to know that Rama and his army had reached Lanka, he sent a demon to kill them. This demon could burn anything just by looking at it.
When Vibheeshan saw this demon coming towards them, he told Rama to shoot arrows with mirrors fixed to them.