Would this be accepted "Octoberben nem harcol a katona"
No, because "October" is "október" in Hungarian, and "nem harcol" is "does not fight" in English.
It isn't good however another correct solution is: Októberben a katona nem harcolHAT.
Do nem, tud, and harcolni all have to be together here? (My first, wrong, submission was A katona nem októberben tud harcolni.)