Editing Sky Serpents (section)

=====Battle of Catachan=====
>The Battle of Catachan
In preparation for the rendevouz of the Sky Serpents fleet and their run on Terra, the auspex net that watches the approaches into the Segmentum Solar must first be dismantled. Individual relays are targeted, but if the entire fleet is to slip through, the coordinating node on Catachan must be eliminated.

Anshul and his allies are well aware of this fact and have augmented the site's already formidable defenses, including an improved orbital defense grid, not to mention forces in orbit and on the ground.
As a result, Xun must rely on stealth and subterfuge to break the initial defenses.
For weeks prior to the assault, Sky Serpents infiltrate marines and members of Section 8 aboard cargo vessels during raids, typically destroying or capturing some number of ships to disguise the true intention of the raid.
Closer to the attack, a small number of Judgement Bringer's craft are quietly captured by the Sky Serpents. Shortly after, Sky Serpents forces infiltrate a supply convoy during a raid use the "Judgement Bringer" destroyers to "chase off" the Sky Serpents raid. These ships protect the cargo vessels bound for Catachan.
Aboard the cargo vessels, the warp drives and gellar fields are sabotaged to deharmonize the warp transit. This aetheric noise allows a Sky Serpents flotilla to follow the convoy in to the Catachan system and masks their entry from sensors. These ships drift quietly towards Catachan as the convoy makes its approach. As they reach the docks, all hell breaks loose, as some cargo ships simply explode, others ram the docks. Critically, one cargo vessel slams into one of the massive orbital weapons arrays, knocking it from orbit.
The destruction seems to spread, irrationally, as other ships, days in-system explode, cargo in warehouses, both in orbit and planet side bursts into flames and ammunition spontaneously cooks off.
In the confusion, the initial wave is able to land undetected.

I'm thinking of leaving out the added complexity of captured Judgement Bringers ships, but the basic idea is this:

>Saboteurs are infiltrated aboard a number of cargo vessels.

>Warp drives are sabotaged to allow smaller Sky Serpents vessels to quietly infiltrate the Catachan system, perhaps over a matter of weeks

>The first wave of landings are covered by some cargo-ships going nuts in orbit, ramming docks and defense platforms. That's actually why I'm considering using captured destroyers-- they can tank more firepower and it's not like the Sky Serpents don't have a reputation for this sort of thing. The ramming docks is a bit unusual, though, since its basically suicide, and the Sky Serpents infiltrators tend to be quicker to cause some chaos when some place is so heavily defended. That and the Sky Serpents tend to bypass such strong points, leading some in the Arms to speculate that the true strike is coming elsewhere, leaving them focused on a warp-bourne assault on the auspex net.

>The sudden chain of explosions raises suspicions and security is tightened, but by this time, it's too late.

>Larger fleet enters the system after capturing a few vessels to lead them in.

>Traitor fleet makes for the mandiville point to repel the Sky Serpents invasion

>The ships that had been snuck into the system fire up the engines and begin their attack runs, even as forces prelanded begin assaulting their objectives

>Open a hole in the orbital net for the Sky Serpents to land more troops and suddenly there's a battle in the jungle, with the local wildlife going nuts from being creeped out by all the psykers.

>Then something else happens, not sure what, maybe the whole attack on the sensor net facility is a feint, they're actually going for the orbital defense net because Xun says fuck it, I'm not going to siege that place, it's got crazy defenses. Instead he knocks out the defense system and orbital strikes the fuck out of it, hard enough to crack the planet's crust.  
With the system down, the fleet can link up and make their dash into the Segementum Solar. From there, they break a Siege over Ryza and reach the Sol system.

Oh, and legion destroyer squads are deployed en masse during the battle, because fuck the jungle.  And all the weird shit that the Asurans have been doing with the local wild-life.
So there's the big, flashy assault on the sensor hub, and the sneakier ones on the orbital command-control nodes and defenses, with Sky Serpents going rambo in the jungle.
These being the actual goal, allowing the Serpents to avoid having to besiege the sensor control node.

Anshul himself probably isn't there, instead chasing Oramar.