Callisto was a dark, barren place, a small moon orbiting the great orb that was Jupiter. It was divided equally between the prosperous settlers of the United States of America...and the dark foundry mines of the Fourth Reich. No contact was had between the two. The Germans sat in their domes, working day in and day out to supply the great ships that plied the routes between the Sol Sytem possessions of the Reich and thence back there to fuel the foundries and the warmachines of that dismal place. No contact was had...until now.
The colony was a small one, typical of the American frontiersmen way of life that had erupted on their off-world possessions. New Grantville was typical of such settlements, no more than about two-hundred souls making a living from the mining and surveying jobs that could be found on their half of Callisto. It had bars, habitats for the people, clinics, even emergency stations, all part of the standard frontier colony package set up wherever the United States set up shop. But it wasn't a fortress. And that would prove to be its undoing.
They came in low and fast, just sweeping above the horizon. Three 'Adler'-class transports, wings forward-swept like a bird of prey and decked out into the grey, blue and black flecktarn camouflage of the Raumwaffe, hurtled over the ground at breakneck speeds, circling up from out of the horizon towards New Grantville. Within a few minutes they'd landed just fifty metres away from the domes, belly ramps opening to disgorge a small force. Elite Schutzstaffel troopers cradling heavy Gausshantkanone towered over the averagely sized Volksgrenadiers accompanying them, their long lasgewehrs seeming almost toy-like in comparison to the bulky instruments of death the SS carried. They slithered in three distinct columns towards the slope where the domes edge bit into rock, five SS to each group along with ten to fifteen Volksgrenadiers as support for that Feurgruppe.
They quickly made it to the outer skin of each dome, spreading out to cover three different directions. One SS trooper in each feurgruppe had a bundle of explosives that magnetically clamped onto the domeskin. All ducked back as they were triggered, air rushing out of the great wounds torn into the abdomen of the colony. The SS moved first, cannons traversing with the aim of their ominous green-lensed helmets. The normal Volksgrenadiers followed on behind, wary of getting too close to the SS troopers who practically oozed the scent of blood and death. A vac-suited rescue and repair crew were the first to die, running into the guns of the second feurgruppe. Hyper-accelerated gauss rounds tore them to pieces where they stood, blood and bone fragments scattered across the hallways, shattered bodies left to run their blood into the decking of the corridor as the boots of the Reich soldiers trampled on them.
The first feurgruppe came upon a small warehouse that serviced a storefront. The panicky voices of the inhabitants betrayed the confusion paramount in the thoughts of the New Grantville colonists, and gave the lead SS trooper, a tattooed, menacing figure, thickset with corded muscle and an aura of violence suffusing him, an idea. He barked and growled, forming his brethren into a firing line facing the warehouse exit while the Volksgrenadiers stacked up on either side. Then, with a single swipe of one meaty paw, he signalled the order to fire. Round after round pummelled the metal gate, tearing great gouges through. Then the shells found the screaming customers. Within seconds, the battered gate simply fell forwards, letting the Volksgrenadiers storm in and cut the survivors down with brutal loose las-rounds.
Now the battle for New Grantville would truly begin.