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is this from an actual manga because that would rock
unfortunately it is more of a webnovel: His Soul is Marching On to Another World; or, the John Brown Isekai
It's just a light novel someone's been working on for a couple years but there's some artwork interspersed in some of the chapters. He bashes in the head of essentially the Shield Hero protagonist pulling a catgirl slave behind him with a rock in the first chapter. He then begins a protracted people's war to liberate the rest of the slaves of the world he was transported to.
https://www.royalroad.com/fiction/57505/his-soul-is-marching-on-to-another-world-or-the
