Significant historical events and other vital background. For now I will simply throw links onto here as I think of them. This will later be cleaned and pretty-fied for your enjoyment.
*NOTE: The “40,000” or “40k” of “Warhammer 40k” refers to the year (yes, they do use a roughly Gregorian calendar). So when you see a date listed with “M41” that means it refers to something in the 41st millennium, or the year 40,000. M32 would be the year 31,000. And so on.
*NOTE: Some of what the Lexicanum references is not the Deathwatch game system, but the table top miniatures game.
*NOTE: I currently only have rules for 5 Chapters—Black Templar , Ultramarines , Space Wolves , Dark Angels , Blood Angels , and Storm Wardens . I am willing to make up one more Chapter. My personal favorites are either the Raven Guard or Salamanders . If any of you take a shining to a particular chapter we may be able to work something.