Narsak Soulflayer's Crusade

Narsak Soulflayers's Crusad was an Imperial defensive campaign conducted by the Astra Militarum Themes Shadow Regiment against the encroaching Forces of Chaos, led by their Chaos Lord, Narsak Soulflayer.

Background
The Chaos Lord Narsak Soulflayer and his army known as Maelstrom Flayers attack an unimportant system in the Segmentum Pacificus to acquire a few powerful artifacts, but five Shadow Battalions and Sisters of Battle intervention turn what was in Narsak's plans an incursion into an attrition war which forced him to retreat after he lost most of his forces, but not before swearing revenge against both Sisters and Shadow Regiment.