Hanumaan fought with a great bravery in Raam-Raavan war. He killed several powerful Raakshas, but his main activities are given below.

On second day when Meghnaad came into battlefield to fight and he could not harm Raam, then he used Veerghaatinee power on Lakshman. Lakshman got fainted. Meghnaad got very happy to see this and he went near Him and tried to lift Him up to take Him to Lankaa, but he couldn't even move Him. Then Hanumaan Jee came and lifted Him up like a flower and took Him to Raam. Meghnaad got very ashamed of this and went away.

Seeing Lakshman unconscious Raam got very sad and started crying. Then Jaambvaan suggested that there was a herbalist named Sushen in Lankaa, he can cure Him. But how to bring him there in enemy's army from enemy's city? Then Hanumaan took this responsibility. He went there in a very tiny form, lifted Sushen along with his house and brought in Raam's camp. Sushen asked to bring some herbs from a mountain within that night.

Now who could go so far and come back with those herbs? Again Hanumaan offered himself to bring those herbs. He flew. In the meantime a spy informed Raavan about this. Raavan immediately sent one Kaalnemi named Raakshas to stop him bringing those herbs. Kaalnemi said - "Who has burned your whole Lankaa, who can stop him from doing Raam's work? Meditate He who controls Kaal. Who can win Him?" But Raavan didn't like his advice. So Kaalnemi thought it was better to die from Raam's messenger's hand instead of this Raakshas.

So he went and built a beautiful Maayaa Aashram and a pond in it, and he himself stayed there in the form of a Muni. Flying over that Aashram Hanumaan saw it, so he thought, "let me drink some cool water here and take rest then I will proceed further", so he got down and went to Muni and asked some water. Muni gave him some water from his Kamandal, but Hanumaan was not satisfied with such a small amount of water, so he pointed towards the pond.

Hanumaan entered the pond, that a she-crocodile caught his feet. Hanumaan Jee killed her. She changed into an Apsaraa. She said - "My all sins are washed away after having your Darshan and my Shaap is also cleared. This is not a Muni but is a Raakshas, believe me." and went away. Hanumaan came back and killed that Raakshas and headed towards his destination.

He couldn't recognize the herbs because they stopped glowing when Hanumaan arrived there to take them. So he uprooted the whole Parvat, on which those herbs were growing, and brought it to Sushen.

When he was coming back, he flew over Ayodhyaa. Bharat saw a very large object flying. He thought, "He might be a Raakshas and may be carrying this to attack Raam." So he shot an arrow at Hanumaan and he fell down on the ground. While he fell, he pronounced "Raam, Raam" and got unconscious. Bharat knew that he was not a Raakshas but a devotee of Raam. He went close to him and found that he was unconscious. He immediately remembered Raam and prayed for his coming back to senses. Hanumaan soon got his consciousness back. Bharat asked his introduction.

Hanumaan told everything including that Lakshman was unconscious and if he did not reach there in time, He might not live. Bharat got very sad hearing all this. He said - "I am such an unfortunate that I am of no use to my brothers. But you don't worry, I will send you there in a moment. You sit on my arrow, it will take you there in a moment." Hanumaan couldn't believe this, so he said - "I will go myself." But Bharat said - "Believe me, my arrow will take you there very soon." Still Hanumaan preferred to go on his own.

Hanumaan arrived there in time. Sushen prepared the medicine, gave it to Lakshman and soon Lakshman gained His consciousness. Everybody got very happy to see Him alive again. Hanumaan dropped Sushen along with his house in Lankaa Puree.