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I've Googled a bit for this (it seems the wiki is more barren than it used to be on this subject?), tried the Lexicanum, etc. I'm needing links or info on the following;

Siege of Imperial Palace
Who was there (Chapters both traitor and loyalist, the Custodes, etc)
Primarchs
Did the Traitors already change their colors?
What's the palace look like?
Detailed sequence of events, (Sang broke the Daemons back, etc...details like that)

Anyone have a good link or information on the subject? Thanks!

Tried Lexicanum in english?
Your mistake.

translated the mentioned Sources from lexi:
* 1: White Dwarf, english, 161 (1993)
* 2: Adeptus Titanicus (edit = game) (1988)
* 3: Horus Heresy (Boardgame) - (1993)
* 4: Index Astartes der beteiligten Legionen (edit = index astartes I-IV)
* 5: Realm of Chaos - Slaves to Darkness 1988 (Warhammer 40.000 Rogue Trader)
* 6: Horus Heresy CCG von Sabertooth Games
* 7: The Horus Heresy Vol. I - Visions of War, 2004
* 8: The Horus Heresy Vol. II - Visions of Darkness, 2004
* 9: The Horus Heresy Vol. III - Visions of Treachery, 2005
* 10: The Horus Heresy Vol. IV - Visions of Death, 2006
edit: HH books may cover not the siege of the imperial palace
* 11:X: Horus Heresy (Romane):
* 12: The Flight of the Eisenstein (Roman)
* 13: Fulgrim (Roman)
* 14: Horus Heresy: Legion
* 15: Horus Heresy: Galaxy in Flames
enough sources to draw from?

Hint: lexi is basically run in german, may suck sometimes in english.

Back to your question:

Loyalists present:
Custodes
sisters of silence
Imperial Fists,rogal Dorn
White scars, jagathai khan
Blood angels, sanguinius
Imperial regiments. Only a few mentioned by name.
arbites
ad mech

Titans of the fire wasps

Loyalists incoming, still too late:
Dark angels lion el johnson
Space wolves, leman russ

Traitors:

Sons of horus, Horus
Emperors children, fulgrim(or the demon using fulgrims body)
Death guard, mortarion
World eaters, Angron. (Kharn)
iron warriors, perturabo
traitor guard
dark mech?
cultists ( cheap meatshields)
demons of all sizes

titans of
-death heads
-storm lords

list may and will be incomplete

PS: index astartes I-IV and collected visions would be a good choice for some background.

Thanks for the info!

Follow up question(s), what units were available at the time of the Heresy (I'm using this to decide what I can/cannot do in a pre-heresy force);


Or perhaps it would be easier to list what current Space Marine units were NOT available at the time of the Heresy. Example;

NO Venerable Dreads
NO Land Raider Crusader



Others?

Land Raider Redeemer/Any other Land Raider Varient except the Godhammer Pattern iirc

Land Speeder Storm.

Death Company.

Not 100% sure of the Baal Predator was around then either. Razorback wasn't there either.

Not there:

power armor Mk VII and Mk VIII

stormbolter

Landspeeders, all 4 variants

Tyranid-hunters ( UM )

95% of all SC

Rare:

Thunderhawks ( new stuff then )

There:

Stormbirds
Jet bikes