- After logging into Facebook, click on the profile picture in the top right corner.

- Select "Settings & Privacy," then click on "Settings."

- In the left menu, click on "Your Activity" and then select "Apps and Websites."

- Find Gunship Battle: Total Warfare under Apps and Websites, then click "Remove" next to it.

- In the removal confirmation window, click "Remove" again.

* For more detailed information, please refer to the Facebook Help. [Link]