....see keywords. For this guy, the worst of the worst is World War One, or as he still calls it, the Great War.

Trapped in the trenches under constant bombardment, choking to death on Mustard Gas or other chemical weapons, making a run out into no man's land while being mowed down by machine guns. FUN TIMES.

There will also be some senseless fragments from the Napoleonic wars that killed HRE, that Weimar won't really be able to make sense of. A blonde man in blue, on a horse, bearing down on him for a few split seconds, or the abrupt sensation of being impaled.

Trigger Warning for Rape:

And lastly - and if you want to skip this part entirely for plotting purposes that is totally cool - the Rape of Belgium wasn't just metaphorical. Now, Germany was the rapist, but he was also a virgin before then, and he was kindasorta coerced into it by his bosses and officers. He's still absolutely responsible for what he chose to do, but he was conflicted about it at the time, and he's still fucked up about it; he represses it pretty hard. If he has nightmares, some of them will be of himself, of the worst things he did to her.