No, Chaos Space Marines are the traitors to the Emperor in Warhammer, they believe that the Emperor and everything he stands for is wrong. Space Marines are the ones still loyal to the Emperor fighting in his service against the Chaos and Xenos(alien) threat.
The Chaos Marines were formed when Horus, the Emperors favorite son whom he named warmaster of his troops, fell to taint of Chaos. The Emperor and Horus fought until the Emperor finally killed Horus, but his wounds were so bad he has been put into a stasis chair for the past 10,000ish years.(not positive on the number) Horus, and all the other Chapters who fell with him are known as the Traitor Legions.
Answer
It really depends on the person commanding the armies.
Answer Yes, any army can beat any other army in Warhammer, it's all up to the players' abilities.
Answer
No, you cannot. Play both armies separately.
Yes, you can use them as allies if the Tournament rules allow it, and/or your oppenent agrees.
you take the role of space marines (a superhuman genetic warrior and fight chaos daemons and chaos space marines and orks i dont know the storyline but thats what happens
Eldar Space Marines Imperial Guard Dark Eldar Tau Chaos Space Marines Witch Hunters Gray knights Chaos Daemons Necrons Orks Tyranids
Space marines Chaos space marines Necrons Orks Tau Space wolves Daemon hunters Chaos daemons Eldar Grey Knights Tyranids Blood Angles Dark Angles Dark Eldar
No. You can however use lesser demons and demon princes in a Chaos Space Marine Army.
Chaos Space Marines have a Ballistic Skill of 4
No, only on possessed Chaos Space Marines.
Only in the multiplayer.
Many people would say Space Marines or Chaos Space Marines.
In bulk from your favorite auction website or Craigslist.
it's okay slow start, somewhat like space marine's just has daemons and different vehicles but by my standards it great race.
No. The only armies in the game are Chaos or Space Marines. Being a necron player, I too wish they were in Warhammer 40k: Squad command.
No, the Dark Angels are a chapter on their own, and the are regular Space Marines, servants of the Emperor who haven't fallen to Chaos. Their name is misleading however.