Board Thread:Warhammer 40k General Discussion/@comment-69.142.168.238-20140724005240/@comment-25177957-20140725225328

Like was said above, the traitor fleet could not avoid shifting fire from the Imperial fleet for a mere minute. The battle was so tense that every second counted both on Terra and in orbit above Terra. Plus, minor elements of the traitor fleet had already landed before ships capable of that even arrived in the system. And we're not even sure if the traitor warfleet had the type of weapons the Dark Angels used.

Plus, Horus was no xeno, a xeno would have wanted to destroy Terra, but Horus was obviously a human and wanted to conquer the Imperium to turn it to Chaos, you can't do that if you destroy the homeworld of humanity.