Hanuman bravely attacked Kumbhakarna, hurling a mountain-top at the giant. Kumbhakarna stumbled but did not fall, and then landed his spear in Hanuman's chest. Seeing Hanuman wounded, thousands of monkeys jumped on Kumbhakarna, but the giant shook them off.
Sugriva then struck Kumbhakarna with a boulder, smashing it to pieces on his head while Rama aimed his arrows at Kumbhakarna's heart. Still the giant did not fall.
Rama then used his arrows to chop off Kumbhakarna's arms.
Then his legs.
With one more arrow, Rama sliced off Kumbhakarna's head.
So Kumbhakarna died in battle. He could not escape his fate.
Inspired by: Valmiki's Ramayana.
Notes: This is the Yuddha Kanda (Book 6), sarga 67.