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Since there are countless worlds of the Imperium which are defended in some form of defence forces, mostly Auxilia or Planetary Defence Forces, it is now uncommon to see them in the same homeworlds as the Astartes Chapters and securing the valuable areas while the Chapter is busy doing something else.

So I ask now; how common is the cooperation between those two elements? The most obvious is the Auxilia Ultramar, being directly loyal and obedient for the Ultramarines when needed and taken command, but what about elsewhere?

Is it considered a silly part of the fluff for a Chapter to deploy along with their local PDF forces... or even possibly forming closer relations with them, like the Ultramarines or the once-loyal Astral Claws?

It's not really silly at all. If an Astartes homeworld comes under attack, then it's pretty standard for PDF and the Chapter to fight side by side.

As far as forming a relationship with them, that's tricky because Space Marines are out on campaigns much of the time while PDF, by definition, stay at home to guard their homeworld. Only the new recruits and those who train them would have much contact, unless, once again, the homeworld was invaded, in which case the whole Chapter would usually run home to join the defense. There have been several examples of this in the fluff.

It also depends on the Chapter. Some are friendly to regular humans (Salamanders, Space Wolves) while some are very aloof (Dark Angels and their successors).

If the Astartes' PDF units are deploying, the Astartes are in serious trouble because their homeworld is under attack.

 fallinq wrote:
It's not really silly at all. If an Astartes homeworld comes under attack, then it's pretty standard for PDF and the Chapter to fight side by side.

As far as forming a relationship with them, that's tricky because Space Marines are out on campaigns much of the time while PDF, by definition, stay at home to guard their homeworld. Only the new recruits and those who train them would have much contact, unless, once again, the homeworld was invaded, in which case the whole Chapter would usually run home to join the defense. There have been several examples of this in the fluff.

It also depends on the Chapter. Some are friendly to regular humans (Salamanders, Space Wolves) while some are very aloof (Dark Angels and their successors).

That's what I wanted to know. Thanks for the info

It depends among other things on the space marines tradtions. Some SM chapters almost don't interact with their homeworld at all, and likely have zero contact with their local PDF unless/untill things hit the fan. others are much more involved with their world, and quite possiably are deeply involved with their local PDF, to the point of veterns sometimes going to help train the PDF, and hosting joint training exercises when the oppertunity presents itself

Have impirial fists/templers ever had a PDF or even armed chapter/legion serfs units as my personal fluff is kind of on that line.

In simple terms a templers auxilary as guard are of varying quality and trustworthiness.

as the Imperial fists and black templars are both space based chapters whom do not posess a planetary holding I doubt they have a plaentary guard that answers to them no.

Don't forget that many Chapter homeworlds are feral worlds - there's no PDF at all. Even Chapters based on a world that has a PDF might be too aloof and contemptous of normal humans to even consider training with them.

BrianDavion wrote:
as the Imperial fists and black templars are both space based chapters whom do not posess a planetary holding I doubt they have a plaentary guard that answers to them no.

I'll just have to bend the fluff a bit then. My concept was based on marine corps as a mariner lead fast reaction force tied to the chapter

jhe90 wrote:

BrianDavion wrote:
as the Imperial fists and black templars are both space based chapters whom do not posess a planetary holding I doubt they have a plaentary guard that answers to them no.

I'll just have to bend the fluff a bit then. My concept was based on marine corps as a mariner lead fast reaction force tied to the chapter

I don't think it's bending the fluff, I think it's just going into a part of it that's unexplored. It's perfectly reasonable to assume chapter based fleets have craploads of serfs on their ships, including people who are trained in the art of repelling as well as performing boarding actions.