Disclaimer: Not mine. Not mine at all. Really.
Prolog: Surprise in the Woods
Cally was running through the woods, desperately fleeing the sounds of gunfire, when she suddenly stumbled and fell, her sight suddenly obscured by a vision of a glowing woman's face. Cally whimpered, but suddenly was wrapped in a sense of affection and determination. She felt a sudden connection to, or maybe through, the woman and a vast, terrible pool of strength; there was an abrupt twist in the world, and then the face was gone.
The strength remained, bringing with it a flash of visions of death and pain, memories of fighting with fist and foot, stake and sword and bow. Cally remembered, and knew that she was strong.
Note: Spoilers for BSG S3 and before. If it continues, I'll try to stay reasonably aligned with events in S3 as they unfold.
Chapter 1: Scrap Heap
Cally's instinct to flee had vanished, and she found herself hurtling back over the rough terrain. She wasn't aware of her speed, or how she reflexively threaded between the trees and scrub, or how she was finding her footing so securely on ground that was difficult and treacherous moments ago. She wasn't thinking. She'd become completely overwhelmed by a need to fight back, to protect her people, and so she was going back towards the sound of gunfire.
She'd hardly had the chance to take a breath before she was back at the bottom of the ravine, the shining bodies of the centurions at the top brilliantly reflecting the muzzle flares of their gunfire. Cally leapt the full height of the slope before her, and was among the robots without registering her own leap.
Rolling past the nearest Cylon, she grabbed its ankle and stood, swinging the hapless machine into the back of another before either had processed her presence. Both were crushed by the blow, sparks flaring along their bodies as they became inert. Cally slid under the fire of the next one just as it began to turn towards her; she simply grabbed its arm and turned its fire onto its fellows. Three other Centurions were shredded before it could react and halt its fire. Cally twisted, putting the body of the Cylon she held between her and the others as she reached up with her one hand and pulled the face-plate off her captive. She reached into the cavity, clenched her hand and pulled out the machinery and goo inside, even as she use her strength and momentum to hurl the thing at the closest remaining machine standing.
Running with blinding speed at the next in line, she casually jumped over its fire and landed on its arm. Her fist smashed this Centurion's face, crushing it into the things' armor cowl as she launched herself off the thing's arm over its body, turning mid-air and destroying the next one's face with her feet. Bouncing off its front, she somersaulted and landed facing it, so she body-blocked it into the next one, which was angling for a clear shot at her, knocking both to the ground in a tangle of whirring metal. Cally spun and lashed out with her foot at the last Centurion standing; a crack loud enough to deafen announced the failure of its knee joint; Cally flung herself inside its firing arc, grabbed its left arm and pulled it off smoothly, then dropped the arm and picked the thing up bodily, slamming it onto the Centurions that had almost untangled themselves.
Standing on the top Cylon, Cally pulled off an armor plate and eviscerated the thing; tossing the top robot aside she rapidly finished off the last two in the same way.
Looking around, Cally realized she was bereft of things to destroy. Breathing heavily, what she'd just done only vaguely coming to mind, she turned and looked to the trucks she'd been hauled here in, and the people who'd been taken with her.