During the time of Avatar Kyoshi, a warlord known as Chin the Great conquered the entire Earth Kingdom with his armies, Ba Sing Se and Kyoshi's home peninsula being the sole exceptions. When the warlord marched his armies down to the neck of the peninsula in 270 BG, Avatar Kyoshi avoided a battle and managed to keep her people safe from invasion by using a combination of different bending techniques to separate their peninsula from the mainland and form Kyoshi Island. Many years after the end of the Hundred Year War, Aang brought his son, Tenzin, to Kyoshi Island to ride the elephant koi.