From Warhammer 40k - Lexicanum
The Pontus Rebellion was an Anti-Imperial rebellion that occurred on Pontus, and three squads of the Dark Angels Chapter's Deathwing were dispatched to end it. Though vastly outnumbered, the Deathwing succeeded in breaking the rebellion's back and cleansed an entire Hive in the process.
- 1: Codex: Dark Angels (8th Edition), pg. 50 — Deathwing Squads