Fiction:Grox Vs Imperium of Man

Just for the record, this is NOT canon. This is just for fun at the reccomendation of Operation Marines. Please do not take this seriously.

The Initial attack
The initial Grox attack comes from the galactic north. The first few hundred planets under imperial and Ork control offer little resistance, as the imperial beurocracy struggles to respond. Local Imperial Guard regiments, and of course ork tribes did rally in defiance of the grox invasion but ultimately fail to offer any great challenge to the Grox armada. After several months, the imperium finally send reinforcements in the form of their finest space marines. The Ultramarines, White scars and Space wolves chapters are dispatched to deal with this new threat.

However, this is not the only armed response to the grox prescence in the galaxy. Such activity so close to the eye of terror attracts the eye of the blood god Khorne, and the world eaters are sent forth from the Eye of Terror to do glorious battle with the mighty Grox army. The Imperium, however, know little of this new foe, besides that they are higly technological, and that any world they take becomes uninhabitable, and any whom venture there swiftly die (As they can only live in Terra-score 0 planets). Their best guess as to the nature of the Grox are that they are some form of demon, and this assumption proves to be their undoing.

Both the Imperial army and chaos converge on the Grox stronghold of Sperax III, and nigh-simultaniously charge into battle with the Grox forces on the ground. However, when two forces attack one other force, it is rare for either of those two forces to go unaware of one another for very long. The Imperial forces immediately assume the World eaters to be allied with the grox, and first the Space wolves, THen ultramarines, then even the White scars turn their attention to dispatching the chaos forces. The Grox need not even fight, they simply sat back and watched as the humans wiped one another out. Once the battle was over, only some few Ultramarines remained, which the Grox easily slaughtered.

The Imperium strikes back
The Grox continue their quest to scour the universe of all life, dispite those few losses they took at Sperax III. They take many worlds, and the high lords of the Imperium worries that soon they will have taken much of the galaxtic north. Their forces struggle greatly to deal any visible damage to the Grox armada, and become desperate for a plan. Eventually, they decide on what to do. Lure the main Grox fleet into the Eye Of Terror, let chaos destroy them, and then retake the now relatively defensless planets for mankind. They recognise that in this plan, mobility will be of the essence, and they send the White scars and Dark angels Ravenwing company to the galactic north to carry it out, backed up by huge numbers of cadian imperial guardsmen, to block any potential escape routes for the armada.

The white scars launch the initial assault upon the grox fleet, while the ravenwing wait closer to the eye of terror to supply ranged support, and to draw the attention of the grox once the white scars entered warp to flee from the battle. The White scars engage the Grox fleet in open battle for less than a minute, destroying many fighters and even one large battleship, before escaping. The Grox immediately focus their attention on the ravenwing, who enter warp and exit again, just inside the Grox sensor range, in the direction of the eye of terror. They repeat that pattern again and again, warping right as the grox enter weapons range, until finally they reach the eye. The Ravenwing, having completed their part in the plan, warp out to return back to Terra. As this happens, yet another ambush is conducted against the grox, now by the Cadian ships. Infurated by the lengthy persuit of the ravenwing, and the repeated ambushes, the Grox furiously follow the Guard ships into the eye of terror. Neither force is seen until much later in the Grox invasion.

The rallying of the Eldar
An odd series of events occur at this point, throught the galaxy. Every craftsworld known to the Imperium abandon their current positions, be they struggling to hold back a tide of tyranids, keeping a daemon prince of Slaanesh in check, or simply ensuring a Dark Eldar cabal does not get out of hand. These craftsworld all uniformly head in the same direction, towards the galactic core. Furthermore, many maiden worlds are fully evacuated, no single Eldar remaining, presumably to aid in whatever events are occuring at the core.

It appears that the Eldar are doing much more for the survival of the Imperium than was previously thought, as there is a massive upsurge in Chaos, Necron and Dark Eldar activity. Many imperial forces are diverted away from the Grox territories to keep the rampant chaos armies in check, and the Ravenwing company are sent to relieve various forces plauged by Dark Eldar attacks in the Galactic east. With only the White Scars to combat them, the Grox have time to rebuild their armada, in order to begin anew their crusade against life. In the space of two years, they do so, and thus a new offensive begins