As plantation policy expanded to outlying districts including Sligo, Fermanagh, and Monaghan the English occupation of Ireland grew increasingly militaristic. The Counter-Reformation created an environment of anti-Protestantism within the native population which hindered English influence and led to a massive uprising ending in 1603. It became increasingly clear that the only profitable gain from its recent subjugation of Ireland was the land it yielded. Tens of thousands of Protestants, mainly Scots, were emigrated to Antrim and Ulster, replacing the Irish residents.