Recusant

Near-synonyms: (all sometimes synonymous) Dissenter, Nonconformist, Free Churchman; autem cackler (archaic cant)

Near-synonyms: refuser, defier, dissenter, objector, protester, iconoclast, maverick, nonconformist, rebel, refusenik, renegade

Still, to disobey a direct order in the field is no small matter in any circumstances, and especially in Sparta. The recusant captains must have known how dangerous their defiance was to them, yet they risked it.