Battle of Eylau
Wounded, Rüchel narrowly avoided capture during the next few weeks. During the maneuvers that ended in the Battle of Eylau on 7 and 8 February 1807, Rüchel commanded the 4,000-strong Prussian garrison of Königsberg. At that time, Anton Wilhelm von L'Estocq led the 9,000-man Prussian field force.