The 16th century bears witness to several critical military developments. The most obvious is the emergence of firepower on the battlefield. Gunpowder was several centuries old by that time, but it remained a rare and expensive siege weapon. In the 16th century, all of that changes. Cannon are lighter, limbered on smaller and more manoeuvrable carriages. Suddenly, armies have a powerful and portable siege train. In a matter of a few years, every...