It's largely superficial and I didn't care for using WW2 as a plot crutch (no other wars exist, which could double as a bonus history lesson too), and just how did they take over the ship*...
VOY Season 4: "The Killing Game, Part I"
But it's a downright creepy concept in that this crew of 150 or whatever would be forced to fight simulated battles, near to death, then patched together again just to do it all over again.
* I'd hope it'd be done more convincingly than the Ferengi had in "Rascals"![]()
I'm glad we never saw that battle. But I can definitely see the Hirogen taking them over.
We saw multiple ships, I think it was 4 or 5. FAR more likely they succeed in taking Starfleet ship than a group of Ferengi in a pair of outdated Klingon Birds of Prey.