Charles perceived the unrest in Scotland as a rebellion against his authority, precipitating the First Bishops' War in 1639. Charles did not seek subsidies from the English Parliament to wage war, but instead raised an army without parliamentary aid and marched to Berwick-upon-Tweed, on the border of Scotland. Charles's army did not engage the Covenanters as the king feared the defeat of his forces, whom he believed to be significantly outnumbered by the Scots. In the Treaty of Berwick, Charles regained custody of his Scottish fortresses and secured the dissolution of the Covenanters' interim government, albeit at the decisive concession that both the Scottish Parliament and General Assembly of the Scottish Church were called.