The Noldor readied themselves for war, not knowing they were playing according to Melkor's tune. It was Fëanor who cried out against the Valar, and called for freedom from their tyranny. Disturbed, Finwë, the first king of the Noldor, called for a meeting and summoned all his lords, but before they could commence, Finwë's second son Fingolfin rushed to him and blocked his father's entry into his halls and urged him to act and curtail Fëanor and his warmongering.
But as he spoke, there came Fëanor, the Spirit of Fire, fully armed and clad head to toe in armor, wearing a helmet adorned with a big red plume. "As I suspected! My half brother has reached my father before I, as is always and in every other event."
He drew his sword at his half brother, and called out: "Move along and take thy rightful place!"
Fëanor was the eldest son, not Fingolfin, but Fingolfin did not trust Fëanor, nor did he think Fëanor spoke for all the Noldor, but Fingolfin merely bowed his head and left without a look at Fëanor.
But Fëanor followed Fingolfin for this act of disrespect. At the doors of the Halls of Finwë, he stopped Fingolfin at the tip of his shining blade, pressed into his half brother's chest.
"See, half brother, he said. "This blade is sharper than thy tongue. Try to take my position and the love of my father again, and perhaps it will rid the Noldor of one who aims to become a master of slaves."
All in the square heard Fëanor's threat, so the Valar could no longer ignore Fëanor's words and actions and stepped in. Fëanor was the first to break the peace of Valinor and draw a sword against his own kin.
Fëanor was banished for twelve years from the Noldor city of Tirion.