This monograph analyzes military escalation and intrawar deterrence by examining two key wars where these concepts became especially relevant: the 1973 Arab-Israeli War and the 1991 Gulf War against Iraq. A central conclusion of this monograph is that intrawar deterrence is an inherently fragile concept, and that the nonuse of weapons of mass destruction in both wars was the result of a number of positive factors that may not be repeated in future conflicts.