(Alright. I'm gonna change things up from how they were, since I don't like reusing stuff. So I'm gonna say you lost the Ork battle, but managed to escape out into the wastes.))
The few survivors of the Oupost, haggard and worn down by the Waaagh! that destroyed their last refuge, wander the Wasteland that used to be a sprawling agri-world. Wind-blasted flat areas are dotted with destroyed cities. They trek, covering miles of ground, living off of abaondoned store houses and whatever is left behind. It's still not enough for most, and many of the men die of starvation, trckling down to only a few dozen remainders. Then, a blaze. It starts out as a pinprick of light, breaking through the desolate cloud cover. One of the Sergeants spots it first, squinting, not believing his own eyes as to what he's seeing. Then, recognition. "
Men, by the Emperor, they've come!" he says, falling to his knees and crying, something he has never done in his entire service. The other men look up, the pinprick of light steadily growing into a recognizable form - a Valkyrie. As it descends, a cloud of dust and debris obscures it, and the Guardsmen only hear the sound of a ramp descending. A figure comes out of the cloud - an imposing figure, with the markings of the Deathwatch. The surviving Guardsmen not already on their knees now kneel, showing respect to the venerated warriors. The saviors of humanity. "
Rise, soldiers of the Imperium. Your sacrifice has not been in vain. The Emperor's might has come." A grave voice says over the Marines vox system. Behind him, hundreds of Guardsmen and a dozen other Marines disembark from the ship, unloading equipment as Chimeras and even a few Leman Russ tanks drive off the ramp. "
Now is the time to take back what you have lost." he marches off, over to the other Marines, giving instructions. An Assault Marine accompanied by two Devastators, a Commissar and his squad, and a fresh Imperial Sergeant disembark after the tanks, surveying their soroundings. An impromptu Imperial base was being built around them, with autocannon nests and entrenchments taking place. The war has only just begun.
Hands of Justice: four Cadets in squad, four at (30/30) las rifle, at loading ramp
Commissar Dave: At loading ramp, (20/20) Las Pistol, Chainsword
Assault Marine Thule: At loading ramp, (15/15) Bolt Pistol, Jump Pack (100%), Chainsword
The War Dogs: Seven Guardsmen, Six at (30/30) las rifle, one with [3] Grenade Launcher (4/4) Frag, At loading ramp
Sergeant Johnson: At loading ramp, (20/20) las pistol, Chainsword
Devastator Marine Mask: At loading ramp, (100/100) Heavy Bolter, Combat Knife, Lockdown Boots
Devastator Marine Vandar: At loading ramp, (100/100) Heavy Bolter, Comat Knife, Lockdown Boots
((And I think thats everyone. Also, discount any ammunition (Like extra mags) except for what you have in your clip. we'll assume you always have some extra on you, but you will still have to reload at some point. Sorry for the late update, I was taking care of IRL stuff.))