Book of Yuddha Kanda

Also known as Lanka Kanda, this book describes the war between the army of Rama and the army of Ravana. Having received Hanuman's report on Sita, Rama and Lakshmana proceed with their allies towards the shore of the southern sea. There they are joined by Ravana's renegade brother Vibhishana. The apes named Nala and Nila construct a floating bridge (known as Rama Setu) across the sea, using stones that floated on water because they had Ram's name written on them. The princes and their army cross over to Lanka. A lengthy war ensues. During a battle, Ravana's son Indrajit hurls a powerful weapon at Lakshmana, who is badly wounded. So Hanuman assumes a gigantic form and flies from Lanka to the Himalayas. Upon reaching Mount Sumeru, Hanuman was unable to identify the herb that could cure Lakshmana and so decided to bring the entire mountain back to Lanka. Eventually, the war ends when Rama kills Ravana. Rama then installs Vibhishana on the throne of Lanka.On meeting Sita, Rama asks her to undergo an Agni Pariksha (test of fire) to prove her chastity, as he wants to get rid of the rumors surrounding her purity. When Sita plunges into the sacrificial fire, Agni, lord of fire raises Sita,