join Gilbert in Lorraine, but Otto besieged them at Chevremont near Liège. Before he could defeat them, he was forced to abandon the siege and moved against Louis, who had seized Verdun. Otto subsequently drove Louis back to his capital at Laon. While Otto gained some initial victories against the rebels, he was unable to capture the conspirators and end the rebellion. Archbishop Frederick sought to mediate peace between the combatants, but Otto rejected his proposal. Under Otto's direction, Duke Herman of Swabia led an army against the conspirators into Franconia and Lorraine. Otto recruited allies from the Duchy of Alsace who crossed the Rhine River and surprised Eberhard and Gilbert at the Battle of Andernach on 2 October 939. Otto's forces claimed an overwhelming victory: Eberhard was killed in battle, and Gilbert drowned in the Rhine while attempting to escape. Left alone to face his brother, Henry submitted to Otto and the rebellion ended. With Eberhard dead, Otto assumed direct rule over the Duchy of Franconia and dissolved it into smaller counties and bishoprics accountable directly to him. The same year, Otto made peace with Louis IV, whereby Louis recognized his suzerainty over Lorraine. In return Otto withdrew his army and arranged for his sister Gerberga (the widow of Gilbert) to marry Louis IV. In 940, Otto and Henry were reconciled through the efforts of their mother. Henry returned to East Francia, and Otto appointed him as the new Duke of Lorraine to succeed Gilbert. Henry had not dropped his ambitions for the German throne and initiated another conspiracy against his older brother. With the assistance of Archbishop Frederick of Mainz, Henry planned to have Otto assassinated on Easter Day, 941, at Quedlinburg Abbey. Otto discovered the plot and had the conspirators arrested and imprisoned at Ingelheim. The king later released and pardoned both men only after they publicly performed penance on Christmas Day that same year. Consolidation of power The decade between 941 and 951 was marked by Otto's exercise of undisputed domestic power. Through the subordination of the dukes under his authority, Otto asserted his power to make decisions without their prior agreement. He deliberately ignored the claims and ranks of the nobility, who wanted dynastic succession in the assignment of office, by freely appointing individuals of his choice to the kingdom's offices. Loyalty to Otto, not lineage, was the pathway towards advancement under his rule. His