The ongoing conflict between Israel and the Lebanese militant group Hezbollah is now in its fourth decade and shows no signs of ending. Raphael D. Marcus examines this conflict since the formation of Hezbollah during Israel’s occupation of Lebanon in the early 1980s. He critically evaluates events including Israel’s long counterguerrilla campaign throughout the 1990s, the Israeli withdrawal in 2000, the 2006 summer war, and concludes with an assessment of current tensions on the border between Israel and Lebanon related to the Syrian civil war. Israel’s Long War with Hezbollah is both the first complete military history of this decades-long conflict and an analysis of military innovation and adaptation. The book is based on unique fieldwork in Israel and Lebanon, extensive research into Hebrew and Arabic primary sources, and dozens of interviews Marcus conducted with Israeli defense officials, high-ranking military officers of the Israel Defense Forces (IDF), United Nations personnel, a Hezbollah official, and Western diplomats. As an expert on organizational learning, Marcus analyzes ongoing processes of strategic and operational innovation and adaptation by both the IDF and Hezbollah throughout the long guerrilla conflict. His conclusions illuminate the dynamics of the ongoing conflict and illustrate the complexity of military adaptation under fire. With Hezbollah playing an ongoing role in the civil war in Syria and the simmering hostilities on the Israel-Lebanon border, students, scholars, diplomats, and military practitioners with an interest in Middle Eastern security issues, Israeli military history, and military innovation and adaptation can ill afford to neglect this book.