The article suggests that 1649 transformed Ireland not simply through battlefield victories, but through the interaction of political division, naval logistics, and fear generated by the stormings of Drogheda and Wexford. The coalition’s exclusion of Owen Roe O’Neill weakened resistance, yet Cromwell’s resources and control of Dublin were also decisive. Waterford’s survival through winter complicates any impression of instant conquest, while uncertain civilian totals underline the difficulty of measuring suffering. How far should historians regard the terror caused by Drogheda and Wexford as a deliberate strategic instrument, compared with the material advantages of parliamentary organisation, sea power, and fractured opposition?