By early 1651, it was reported that no English supply convoys were safe if they travelled more than two miles outside a military base. In response, the Parliamentarians destroyed food supplies and forcibly evicted civilians who were thought to be helping the Tories. John Hewson systematically destroyed food stocks in counties Wicklow and County Kildare, Hardress Waller did likewise in the Burren in County Clare, as did Colonel Cook in County Wexford. The result was famine throughout much of Ireland, aggravated by an outbreak of bubonic plague. As the guerrilla war ground on, the Parliamentarians, as of April 1651, designated areas such as County Wicklow and much of the south of the country as what would now be called free-fire zones, where anyone found would be, "taken slain and destroyed as enemies and their cattle and good shall be taken or spoiled as the goods of enemies". This tactic had succeeded in the Nine Years' War.