Drawing from local archives alongside national and international records, this book argues that warfare was the defining feature of government and politics in Scotland for the two decades following the death of James V. It demonstrates that beyond the direct effects of invasion, the need to raise unprecedented taxation, as well as warfare's secondary consequences, such as plague and price inflation, disrupted communities throughout Scotland, engendering enhanced social control. These effects endured for many years after the peace of 1550: new laws were passed to manage those who had collaborated with the invaders and taxation remained high. The post-war decade was one of reconstruction, and it was this which drove religious reformation in 1559-60. The book shows that appreciating the scale of the crown's ambition places the Scottish state's development closer to that of its European counterparts.