アイルランド・カトリック同盟
Meanwhile, the rebellious Irish Catholics formed their own government—Confederate Ireland—intending to help the Royalists in return for religious toleration and political autonomy. Troops from England and Scotland fought in Ireland, and Irish Confederate troops mounted an expedition to Scotland in 1644, sparking the Scottish Civil War. There, the Royalists gained a series of victories in 1644–1645, but were crushed after the main Covenanter armies returned to Scotland upon the end of the first English Civil War.