Animorphs
Animorphs.
Cool friends fighting aliens...more accurately, the pariah of a fascist civilization, minutes before being eaten alive in front of said "ccol friends" persuades and then bioengineers human child soldiers to facilitate an end to an ill-conceived and failing war now reduced to unilaterally exterminating a parasitic, physically disabled species, itself undergoing a violent civil rights movement on their own planet based on their self-recognized flaws, struggling to realize its place in a universe where godlike beings exist and decide not to offer remedy(rules of the god game) and spectate while the parasites overwhelm all vulnerable species in the known universe.
The child soldiers agree to resist the parasites, but at least a minority of them believe genocide is the wrong answer. After being physically and emotionally tortured, shot, repeatedly disemboweled and having their limbs hacked or bitten off by hosts of the parasitic species, however, all of the child soldiers begin taking violent, morally devastating actions that end their lives as they know them.
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Holy shit, finished this one earlier today and I did not expect it to escalate that significantly. I figured they might recruit a second team, not quadruple their numbers and then that last brawl at the school for the blind was both awesome and kind of terrifying to actually imagine, really drives home how potent any sizeable force with good battle morphs can be, the sheer mayhem of that much going on at once was incredible. Kind of reminds me of the scene in LotR RotK when the gondorians are getting ready to defend the gates and then its trolls that come through, but this time it was the good guys busting it down.
yea it's absolutely crazy! These concluding books, even though I had read through the whole thing before, shocked me on the last reread all over again.
you're right about the expansion of the size of their forces completely changing the game, I think it's really interesting how the authors name and count every single individual added to the animorphs, it's a good way to make you keep in mind that even though there are more kids, every single one is a person individually deciding to go to actual war and take real risks.