Amid the fanfare around AI and autonomous weapons, decision-makers - both military and political - are imagining an augmented future for warfare that minimises human influence and connection. But in their rush for speed and lethality, leaders have failed to understand the behavioural and technical challenges that accompany these new weapon types, as well as the detail of their operation and the practicalities involved in deploying these assets on tomorrow's battlefields. Indeed, as autonomy starts to flood fighting practices, the classical concepts of combat, tactics and strategy may no longer be fit for task. We are not ready and, as this book makes clear, human oversight over lethal engagement is critical if we are to do more than suffer defeats faster.