This book presents a systematic and concise overview of DE with a unique focus on developing a mathematical modelling framework for DEW performance prediction. It provides you with a comprehensive introduction to DE and its historical roots and walks you through effective methods for countering UAVs and other unmanned swarms, with examples provided to illustrate results. The book focuses on both high-power radio frequency and high energy laser performance prediction and equips practitioners with the toolset to predict DE performance and pursue future research directions. This is an important book for engineers, technical specialists, and managers working in the defense industry, including government and private contractors, as well as research practitioners at universities and engineering organizations worldwide.