Civil war outcome studies have used expected utility logic to identify factors that affect actors' estimates of the probability of victory, the payoffs from victory vs defeat, and the accumulated costs of fighting until victory is achieved. Tests have used static measures of national attributes and war characteristics, measured prior to the war or at its end. We use UCDP Georeferenced Event Data from 73 civil conflicts in Africa to estimate how changes in government and rebel tactical choices on where and when to fight battles affect expected utility estimates and, therefore, civil war outcomes.Previous studies on the outcome of civil wars (i.e. whether they end in government victory, rebel victory, or negotiated settlement) have employed expected utility logic to identify a set of factors that should affect the choice by governments and rebels between continuing to prosecute the war or quitting, either by conceding defeat or seeking a negotiated settlement. This choice, iterated throughout the course of the conflict, is based on each party's subjective estimates of (1) the probability of victory, (2) the payoffs from victory vs defeat, and (3) the accumulated costs of fighting from the beginning of the war through the present until that time in the future when the actor anticipates s/he will be able to achieve victory. Tests based on this logic, however, have employed as predictors of civil war outcomes static