Ishtar sends down the Bull of Heaven to punish Gilgamesh for rejecting her advance. The bull wreaks havoc in Uruk, causing destruction and chaos. It takes the combined efforts of Gilgamesh and Enkidu to defeat the Bull of Heaven.

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Ishtar's dad sends the bull of heaven because she had asked Gilgamesh to marry her but he didn't because she would only bring bad things so she got angry and told her dad to send the bull of heaven to kill him.

Gilgamesh and Enkidu killed the Bull of Heaven, which belonged to Ishtar. This action angered Ishtar, who sought revenge by causing Enkidu's death.

Enkidu and Gilgamesh kill the Bull of Heaven as vengeance for Ishtar's rejection and to establish their own power and defiance against the gods. Additionally, they see the bull as a direct threat to their kingdom and people, and by defeating it, they prove their strength and heroism.