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Or was it equally spread out on other planets?

It took place across an entire sub-sector.

A major focus of Abaddon's advance was on Cadia, as taking out the pylons would blow open the gate and allow vessels free entrance/exit from the Eye.

However, not every warband or army of Chaos was directly reporting to the Despoiler. Many were just along for the ride, or taking advantage of the confusion to raid and pillage.

What planet "saw" the most action for the war in the sub sector?

cadia

The discussion is further confused by the fact that Cadia is also the name of that region of space. >>

 Furyou Miko wrote:
The discussion is further confused by the fact that Cadia is also the name of that region of space. >>

It's more commonly called the Cadian Gate, which refers to the entire Region.

You've got the planet Cadia, in the Cadia system, in the Cadian Gate. >>

I will just leave this here. It has links to external sources and everything.

http://www.dakkadakka.com/dakkaforum/posts/list/392010.page