The Roman legion was designed for open battle, but Rome won its empire through sieges as much as through field engagements. The ability to take fortified positions — to reduce cities that refused submission, to breach walls that geography or construction made seemingly impregnable — was as central to Roman military power as the legion’s battlefield performance. Siegecraft required different skills, different equipment, and different timescales than open combat, and Rome developed all three to a level of systematic competence that its opponents rarely matched.