Vanguard of Aiur

The Vanguard of Aiur was a Protoss faction loyal to the Conclave. It defended Aiur from the Zerg and later defended the Conclave from Tassadar and the Dark Templar.

Against the Zerg
The Vanguard of Aiur defended Aiur shortly after the Zerg reached the planet. A task force drawn from the Akilae, Auriga and Velari defended a large Khaydarin crystal formation but failed to keep the Zerg from acquiring a crystal.

A Vanguard of Aiur force drawn from the Ara, Akilae and Velari Tribes also failed to defend the Protoss Temple from the Zerg.

Protoss Civil War
During the civil war, the Vanguard of Aiur defended the Heart of the Conclave from Tassadar, Fenix and the Dark Templar. This detachment drew from the Auriga and Ara Tribes. The Heart of the Conclave was destroyed, but this resulted in Tassadar's capture.

The Vanguard of Aiur, using forces from the Ara and Furinax Tribes surrounded Tassadar's prison cell, but Fenix, Zeratul and Terran ally Jim Raynor freed him.