§ Of Túrin Turambar The Silmarillion

But there came a day when the messengers did not return out of die north, and Thingol would send no more. Then Túrin was filled with fear for his mother and his sister, and in grimness of heart he went before the King and asked for mail and sword; and he put on the Dragon-helm of Dor-lómin and went out to battle on the marches of Doriath, and became the companion in arms of Beleg Cúthalion.