The Lippstadt League plans to draw Reinhard to Geiesburg in order to defeat him in a decisive battle. As a part of this plan, admiral Staaden has to lead a fleet to Odin in order to cut Reinhard's fleet from its base. Mittermeyer is sent to intercept Staaden, whose fleet is crushed during the battle of Altener and withdraws to the Rentenberg fortress. Reinhard decides to take the fortress, but the boarding parties are repelled by the garrison, led by admiral Ovlesser. An assault led by Mittermeyer and Reuenthal succeeds, and Ovlesser is taken prisoner. Reinhard wants to execute him, but Oberstein advises to send him back to Geiesburg. Ovlesser is released, but is executed by Braunschweig who thinks he was freed because he turned against him. Fear of treason spreads among the Lippstadt League.