The oath commanded Fëanor and his sons to press to Middle-earth, in the process committed atrocities against their fellow Elves at the havens of the Teleri, known as the first Kinslaying. Fëanor died soon after his return to Middle-earth though the remaining oath-takers, the Sons of Fëanor were still bound by the oath they swore together and are united in one cause to defeat Morgoth and retrieve the Silmarils. Though they lived on in relative harmony with the Eldar of Beleriand for the greater part of the First Age, they committed further Kinslayings against their fellow Elves, and their wayward actions defined the fate of Middle-earth during this time period.