The Industrial Revolution, which took hold in Europe in the late 18th century, changed the lives of people in many ways. The technology of warfare also changed quickly and dramatically. New firepower included powerful artillery, repeating rifles, and machine guns. The old sail-powered wooden warships were replaced by ironclad warships powered by coal-burning engines. Wars of this era were larger conflicts fought on numerous fronts in many countries around the world. Detailed battle maps, primary sources, and biographies offer a more comprehensive view of warfare in the 19th century.