7th Black Crusade

From Lexicanum

Chaos Portal

The Seventh Black Crusade occurred in 811.M37. The forces of Chaos spewed forth from the Eye of Terror past Cadia and then disappeared. This is where it earned the name, the Ghost War. The following years saw a game of hunt and seek which spread confusion, paranoia, disinformation and deceit. Raids became commonplace in far-flung areas but eventually they went back to the Eye and mankind had to simply wait for the next attack.

Also, sometime in this period, the Blood Angels suffered a great massacre at Mackan at the hands of a large group of Khorne Berzerkers led by Abaddon the Despoiler.

Sources

• Liber Chaotica: Khorne
• Codex: Space Marines (3rd Edition, 2nd Codex)