Sadly these walls were not enough to stop Jerry, who soon after established a brutal ice cream regime.

https://en.m.wikipedia.org/wiki/Benin_Moat

In 1974, the Guinness Book of World Records recognised the walls of Benin City as the world’s second-largest man-made structure by length, following China’s Great Wall. The series of earthen ramparts was acclaimed as the most extensive earthwork ever constructed.[9] In 1995, the Benin Moat, alongside Sungbo’s Eredo, was added as an extension to the existing World Heritage Site of the Royal Palaces of Abomey, but it is still awaiting official recognition by UNESCO.[29][30]