So @DragonCobolt and their Watsonian explanation got me thinking, which is always dangerous.
As per Word of God, Midway (and possibly even Holocaust) weren't the first spirits Colossus tried to "recruit". They were just the first ones she could find that were alive and intact enough to fill the roles she needed.
So what other spirits did she try to dig up, and how did those searches end?
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To End All Wars
It was a joint training exercise, allegedly. Something to "improve international relations" and remind the continent exactly who had the largest and (theoretically) greatest military on this side of the planet.
If some of the training rounds were actually live ammunition, well…accidents happened. If the pre-planned defensive positions for the various national contingents were oddly familiar, no one noticed. Humans forgot so quickly after all, especially the details.
But she didn't.
The Lady Colossus stood in a field of poppies, listening to the distant rattle of blank machine-guns and thud of training shells. At last she raised a small silver whistle to her lips and split the silence with a piercing shriek.
"AAAAGGGHH!"
An inhuman bellow answered the shriek of the whistle as a monstrous figure surged its way up through the flowers.
It was made entirely of mud, in a vaguely female shape. Shrapnel and spent shell casings glittered in her skin, and her torso was pierced a dozen times over by broken bayonets. Her hair was made of barbed wire and cut trails into her flesh as she moved. Her face was an agonized snarl, revealing pointed teeth made of machine-gun bullets. Her eyes were nothing but sunken pits, and her body made a gnashing sound as it moved as though dozens of misplaced gears were fighting inside her.
"It hurts…" she moaned, clutching herself and falling to her knees. "It hurts so much…"
"Take your time. I'm told waking back up can be very confusing."
"Waking up?" the figure asked. With every word, yellow gas crept from her cracked lips. Where it touched the ground, the brilliant flowers withered and died. "Why…why did you wake me up? Why couldn't you let me sleep?"
She seemed to notice the effect she was having on her surroundings, scowling in pain as her breath turned the lush vegetation to decay and mud. She groped in the muck and pulled out a battered gas mask, which she pulled over her face before turning the expressionless lenses to Colossus.
"You have a certain set of skills that would be particularly useful," Colossus remarked casually. "I calculated that you might be among the easiest to awaken, given your reputation for…let's call it 'tenacity'."
"No. This is wrong," echoed the voice from within the mask.
"You should have let me die. You should have let me sleep. I…I can't be awake. Do you know what I am? What I did?"
Colossus arched a gleaming eyebrow mildly as the voice in the mask rambled on.
"They were so young. So full of excitement, so full of hope. They were so beautiful. So I ate them."
The figure grabbed one of the broken blades embedded in her torso and dragged it across her gut, sending a cascade of tar and filth onto the ground. She pulled apart the edges of the wound, revealing the sharp, rusty metal gears that ground maliciously within her, spitting sparks as they slashed against each other.
"I was supposed to protect them, and instead I ate them. I ground them up, body and soul, until nothing was left. Thousands at a time, and still they sent me more."
"They died with honor, fulfilling their duty as soldiers. It was why they came. It's why you were constructed."
"Honor isn't worth what I did to them. Duty isn't worth what I did to them. Nothing could possibly justify it. Death would have been better." Blank lenses bored into Colossus' dispassionate metal eyes.
"And oh, how I gave them death. I gave it to them by the bucketful, and always they came for more."
She put her hands into the mud again, and they came out dripping crimson. Overhead the sky grew dark as billowing smoke began blotting out the sun.
"You were an evil," Colossus agreed calmly, "but a necessary one. And circumstances have made you necessary again."
The figure cocked her head to one side, like a carrion crow spotting something glittering in the mud.
"I know you," she said finally.
"Doubtful."
"They were always there, at the edges. Little people wearing shiny bits of metal. They fed their children to me, tens of thousands at a time, and when I ground them up they fed me more. Always it was 'necessary'. 'Worth it in the end.' 'A heroic sacrifice for a heroic cause.'" The figure crouched like a predator preparing to pounce.
"They stuffed me with the babes of an entire generation, but never had the courage to face my jaws themselves."
The drone of biplanes filled the air as the occasional clap of training artillery was drowned out by the thunder of huge mortars. The ground gave way behind the figure, collapsing to form a trench full of dead-eyed men with rifles and bayonets.
"I know you. I know your empty words, your bloody mathematics, your bits of gleaming metal. You will not escape me this time. I will slog through miles of mud. I will rip through forests of wire. I will storm any bastion, seize any bunker. I will never stop, no matter how much it costs. I will have you, and I will grind you."
The figure began inching forward as the lumbering bulk of primitive tanks ground their way up behind the expanding trench line.
"I will blast you apart with artillery. I will shoot you to bits with machine-guns. I will choke you with gas. I will snipe you, I will bomb you. I will infest you with rats, I will infect you with disease. I will stab you, slash you, club you, stomp you. I will grind and grind and grind until at last you learn what they learned."
Fire burned behind flat lenses as hundreds of dead men prepared to go over the top.
"I never should have existed, and I always should have been the last."
The figure pulled aside her mask to raise a rusty, bent whistle to her broken lips.
Colossus moved first. In a single smooth motion, she drew a pistol and fired it up into the air. A flare shot forth, followed one after another along the unsuspecting lines of the living. The sound of the mock battle abruptly stopped.
As the figure froze in confusion, Colossus bent down to the portable radio set at her feet.
"All points, confirm receipt of order with code phrase 11-1918."
"Order confirmed, all quiet."
"Order confirmed, all quiet."
"Order confirmed, all quiet."
"Order confirmed, all quiet."
"Order confirmed, all quiet."
Colossus nodded. "And our foreign friends?"
"French and German forces confirm. All quiet."
"All…quiet?" asked the figure in disbelief. The drone of the biplanes vanished, the grinding tanks melted away.
"Is…is it done?"
"For you it is," Colossus confirmed as the trenches sealed shut, burying their long-dead occupants once more. "You have some useful traits, but it's clear you are far too broken to be what I need."
"So it's over? I can rest?" asked the figure, pulling off her mask to reveal tears falling from the dark pits where her eyes should be. "Can I…can I finally die?"
"No. Someday, perhaps, if my plan works. But you can rest." Colossus smiled a cold, metal smile. "I doubt anyone will bother disturbing you."
The figure smiled in relief, showing a mouth full of blood and bullets, then collapsed backward. She dissolved into poppies, covering the nearby fields and leaving no indication the nightmarish figure had ever been.
Colossus turned coldly back to her radio and changed to a very specific channel.
"This one was useless. We're moving on to the next one."
"Yes, my lady. I'll give the orders."
Colossus turned off the radio with a dismissive click, turned on her heel, and walked off through the field of blood red flowers.