In the midst of ongoing armed conflicts in Yemen, Ethiopia, and myriad other locations, understanding potential tools for mitigating these crises is necessary. Paul Williams and Alex Bellamy’s third edition of Understanding Peacekeeping is timely. In this volume, Williams and Bellamy continue to build out their original 2004 release by evaluating and providing in-depth discussions of the changes in the international landscape and the drivers of peace operations over time. This is a textbook of peace operations centered on those endeavors that incorporate military personnel, which provides students and scholars in-depth analysis. For academics and students interested in peace operations, this book is a necessary research edition that could be used as a primary text for advanced undergraduate and graduate courses.