Horizon

A child of the future or somewhere else in space reads her report to the class, out the window to her side a string of space stations seen stretched around a world below.

Child - "And peace was finally made and all the remnants of the great war left to live in the heavens above, leaving behind the desolate world that they made below, where none could survive."  

She smiles proud of herself as the nearest station out the window is mired by explosions yet to be noticed by the class.  More missiles strike from below until it falls out of control.

Child - "Radioactive and forgotten for all but the rare minerals we need to power our tools and machines, to be harvested today by drones came to call 'the Hectors'."

Hectors flee the veering station, its edge dipping atmospheric, running from their bays and leaping into converted forms for flight.

She sees the horror on the faces of the class looking to the side out the window, she looks herself as the station veers into near collision with their own, falling just beneath it.  She stares ...

Child - Eyes wide, words numb ... "The end."

From the ground below the station seen falling. a military commander watches with binoculars.  He drops them down.

The station filled with screams and emergency flight alights with fire on entry, a great forest below, steeping unto the crash, a gust wind from impact in the commander's eyes.

Zain - Smiles ... "Harvest time."  He motions his army forward, soldiers followed by tall Hectors of their own.

~ Horizon ~

The battle on ground begins as the Hectors above descend into walkers, those below leaping into flight, apparently converted to be manned with broad 'X' rough painted to mark.  They don't 'become robots' so much as become walkers for mining and combat with no concern for humanesque forms, more like great beasts.

(and excellent toys)