Attacking the enemy in an ambush is a devastating advantage at war. The Ambush explores weapons that stayed undetected until their very strike revolutionized warfare. The caltrop brought down the cavalry when it made entire battlefields impassible. Being able to load and fire a rifle from a lying position made a huge difference during warfare. The insidious landmine weakens every leftover moral of the enemy's army. What if future soldiers' cover becomes invisibility?

Often times civilians suffer from waging a war - in this episode, experts track down three weapons that were used to recklessly attack civilian populations. With no regard for civilian casualties, the trebuchet hurls heavy stones against solid castle walls. Deploying biological weapons is a chance to conquer a fortress without destroying it. Designed to put an end to World War II, the atomic bomb embodies fear and terror to this day. Now, a cyber war could be most devastating, affecting everyone's reality.