This will be the Imperial Navy campaign, so there will be far fewer units, and any troop vs. troop battles will be small boarding parties on both ends (Though Tyranids will be slightly larger). Ship weapons will be divided into Weapon Batteries, Missile Tubes, and Special Weapons. This campaign will take place in the Segmentum Obscurus of the Imperial holdings.
Weapon Batteries will consist of six to ten turrets, or cannons of some kind, the type will be the first part of the name (EX: Laser Turret Battery). These will be the main weapons of all ships you will ever control, or see, and will most likely be the most important weapons/targets you will have. Weapon Batteries will be used as Anti-Missile weapons, main ship-to-ship weapons dealing small to medium amounts of damage to hulls, and even Anti-Fighter/Bomber weapons if need be.
Missile Tubes will be used to launch the varying projectiles you will have access to from basic missiles to the very precise armor piercing explosive missile. These will be your main long range weapons, and are extremely important early engagement weapons, because of this they will be the main targets of enemy bombers.
Special Weapons are things such as Railguns that can deal massive amounts of damage to ships even take out entire sections of an enemy's fleet in the process. Though these come with immense sacrifices, a few of which are the immense amount of space required, and massive quantities of energy that are also required to use them. For example a railgun can be the most important weapon in taking down a ship that far surpasses yours, but once it fires it will take a large chunk from your current, and reserve energy which could straing, or even force the shutdown of systems in decreasing importance of said system.
((And yes this is a poorly disguised bump filled with game related info.))