In "The Most Dangerous Game," when and why does General Zaroff first come to his island?

General Zaroff is from the Russian aristocracy. During the Russian Revolution of 1917, there was a bad defeat against upper-class Russians like Zaroff. Like most aristocracy, he then left Russia and spent years hunting in places such as Africa. Later, he heard about the great hunt available in the Amazon, but once there, he realized he was beyond traditional hunting. It was no longer a challenge for him and he was bored. He decided that instead of quiting the sport he would hunt a "new animal" and bought the island on which to do so.