BFG: Siege of Corilia, Prelude

The Astropath Primaris had been in a trance for some minutes. Undisturbed as he was, he travelled through the Void, seeking any vision, an echo, anything that would reveal a sign in the future. Dum, dum, dum, bright and vibrant. Then he suddenly opened his eyes. "I sense great danger, something is approaching fast through the Ghoul Stars Nebula."
He need not say anything else. Messengers were quickly dispatched. General Staff arranged meetings. Planetary Militia started mobilizing. Orbital stations were put on high alert. Sector Fleet Command issued a concentration Primary Order.
There could be only one to emerge from the Ghoul Stars. The planet was in the path of a Waagh Fleet.

Planet Corilia is an important cog in the general defence planning of Subsector Cydonia. Numerous ore mines produce high quality resources for the various manufactorums, their chimneys never ceasing to spew combustion gases. Promethium is flowing from derricks near Hive Primaris, its volumes so great that it has created an artificial lake, waiting to be used or transported elsewhere. Four perimetrical hive cities provide the needed labour for the adjacent facilities, while the vast Hive Primaris is the seat of government and administration, as well as general coordination of production, logistics and surface defences. Each defence sector is served and secured by an orbital base, where fleet maintainance is performed.
Any attacker will have to get through the starports' defences before dropping troops on the surface, where six regiments of the local Imperial Guard are waiting in prepared positions.

Campaign Forces:

Battleforce Ignus

Emperor class Battleship			Deliverance	365
Vengeance class Grand Cruiser			Venerable	230
Mars class Cruiser			Colossus	260
Jovian class (carrier) Cruiser			Basilisk	260
Tyrant class Cruiser			Ardent	180
Tyrant class Cruiser			Apollo	180
Tyrant class Cruiser			Neptune	180
Lunar class Crusier			Fury	180
Lunar class Crusier			Cavalier	180
Lunar class Crusier			Reaper	180
Lunar class Crusier			Tracker	180
Dauntless class Light Cruiser			Hound	110
Dauntless class Light Cruiser			Hunter	110
Escort squadron x12				420
				3015

Waagh Fleet

Space Hulk			Green Haven	550
Hammer class Battlecruiser			Smasha	245
Hammer class Battlecruiser			Crusha	245
4 Roks				320
Smasha Battlegroup
Terror Ship		Nazdreg		175
Terror Ship		Muzgob		175
Terror Ship		Gobbla		175
Terror Ship				175
Terror Ship				175
Kill Kroozer		Bomba		150
3x4 Onslaught (1 destr)				360
3x4 Brute (1 destr)				300
10 Transports
Crusha Battlegroup
Kill Kroozer		Ork Royal		150
Kill Kroozer		Splitta		150
Kill Kroozer		Krooza		150
Terror Ship		Marauder		175
Terror Ship		Da Green Baron		175
Basha Light Kroozer		Runt		90
Basha Light Kroozer		Sneaky		90
Basha Light Kroozer		Hunta		90
Basha Light Kroozer		Rusty		90
3x4 Brute				300
3x4 Onslaught				360
3x3 Grunt				270
10 Transports
				5135

First contact was made. Three Lunar class Cruisers responding to the Concentration order encountered a small Ork raider warband. After an intense battle, the raiders were annihilated (2 terror ships, 4 Brutes, 4 Onslaughts) while the Navy had a cruiser crippled (Tracker) and minor damage to the others. The victorious squardon made haste towards their spaceport.
Captain Stradden reports:

When they spotted us, they poured towards us, ever-thirsty for battle, as anyone would expect from the accursed Orks. Their morale was high. My squadron engaged them following the Navy's standard procedures, scattering their escorts with a combined salvo of MK-IV torpedoes, then opening at the Terror ships with the broadside batteries. Forwarding tactical conclusions to Fleet Command: Their battle-lust keeps until they are half-beaten. They then turn tail as any other worthless xeno in the universe. Ork coordination seems to be lacking, attack-craft launch times varied wildly and their formations are inflexible. Our lack of anti-aircraft protection proved costly.