Beneath a pub in Leighton, England, archaeologists uncover a 17th-century blast furnace that once churned out iron and cannonballs for Royalist forces during the English Civil War, decades before the Industrial Revolution took hold a few miles away at Ironbridge. The excavation team works through slag pits, casting arches, and the remains of a massive water wheel that once powered the charcoal-fueled operation, piecing together how the site turned raw ore into weapons of war. Specialists explain the furnace's construction and output, and trace why a forge once central to wartime production became obsolete as industrial methods advanced. The dig moves at the pace of real fieldwork, with finds examined on site and placed into the broader context of Civil War supply lines and early English ironworking. It is a close look at an industry that left almost no trace above ground, recovered one layer of soil at a time.