Sarg 63 - Raam Prepares Shatrughn to Kill Lavanaasur 

Shatrughn said - "It is not proper for a younger brother to have his own Raajya Abhishek, the elder brother being alive, still I will obey you. This is Ved word that "It is A-Dharm to have younger brother Abhishek in the presence of elder brother." I asked only the permission to kill that Rakashas intercepting Bharat, this is the result of the same. I should not have intercepted Bharat, nor I should have said anything to you also about your orders, but I replied so I will have to bear its result."

Raam collected all materials for Shatrughn and performed his Abhishek. Public rejoiced the occasion. Kaushalyaa. Sumitraa, Kaikeyee and other queens of Dashrath sang auspicious songs. Raam said to Shatrughn politely - "Hey brother, Take this divine arrow and kill Lavanaasur with this arrow. Bhagvaan Vishnu created this at the time of Mahaa Pralay. Bhagvaan killed Madhu and Kaitabh from this arrow only and then created the world. I did not use it at the time of fight with Raavan. 

Shankar Jee gave one trident to Madhu, the same trident is now with Lavanaasur. He has kept that in his house and wander around for food. When he faces any enemy, he burns him with that trident. That is why as Lavanaasur goes out of his house you stand at the door of his house, so that he cannot reach to his trident. If he gets to his trident, then you will not be able to kill him. Because Rudra's trident cannot fail.

Sarg 64 - Raam Teaches Shatrughn Fight Tactics 

Raam further said - "Hey Shatrughn, If the army is happy and pleased, you can take many kinds of work from them, that is why it is always god to respect them besides your own brothers, friends, wives etc. You yourself are intelligent, you know all these things very well. You take 4,000 horses, 2,000 chariots and 100 elephants, secretly and fearlessly. Just keep in mind that fight with Lavanaasur only when he doesn't have his trident in his hand [otherwise you cannot kill him]. You may camp your army on the banks of Gangaa, and then you go alone carrying bow and arrow.

Hearing this Shatrughn called his army chiefs and instructed them to camp on the banks of Gangaa until further orders. Then Shatrughn did Pranaam to Kaushalyaa, Sumitraa, Kaikeyee, Raam, Lakshman, Bharat, Vashishth etc and started his journey.

Sarg 65 - Vaalmeeki Tells the Story of King Sudaas 

After one month the army had left, Shatrughn left Ayodhyaa for Madhu Van alone. Third day he arrived in Vaalmeeki's Aashram and planned to pass the night there only with the advice of Muni. Muni welcomed him and arranged for his boarding and lodging. Then Shatrughn asked - "Bhagvan, Who has done Yagya at your nearby place?" Vaalmeeki Jee said - "Among ancestors there was Veer Ras named son of Raajaa Sudaas. He was very mighty and religious. One day, when Sudaas was on hunting expedition, he saw two Raakshas with lion-like faces. He saw them eating many deer etc animals, so he killed one of them with his arrow. Then the other Raakshas came to him and said, "You have killed my companion, I will surely take revenge of this."

After some time Sudaas performed a big Yagya under the guidance of Vashishth Jee. After the completion of the Yagya, the same Raakshas came to Raajaa in the form of Vashishth Jee and said to him - "Hey Raajan, Now your Yagya is complete, so satisfy me by feeding me non-vegetarian food. Raajaa ordered to cook non-vegetarian food. The cook got surprised to hear such an order from Raajaa. Raakshas also knew this. So he took the form of the cook and cooked human flesh and told Raajaa that the food was ready.

[Sudaas didn't know anything about all this]. He offered that non-vegetarian food to Vashishth Jee with his wife Madayantee. Vashishth Jee found human flesh in the food. He got angry and he gave him Shaap to be a Raakshas. Sudaas also took water in his hand to give Shaap to Vashishth, but his wife Madayantee stopped him to do so. She said - "Hey Raajan, Please do not give Shaap to Devtaa and Purohit-like Vashishth Jee." Pacifying his anger, as Sudaas released the water on his feet, his feet got black. Since then he is known as Kalmaashpaad (whose paad=feet are kalmaash=black).

After this the king and queen told everything about that Raakshas to Vashishth Jee. Then he found out everything from his Yog power and said - "Hey Raajan, My Shaap cannot be a lie, but you will be freed from this Shaap after 12 years. You will not even know when this time has passed with my power." So Hey Shatrughn, This Yagya place is the same where Sudaas did his Yagya." Then Shatrughn went to his hut after greeting him.