 Complete the following phrase:  Bennigsen shifted his army north into East Prussia and launched a stroke at the French strategic left wing. The main force of the blow was evaded by the French at the Battle of Mohrungen in late January 1807. In response, Napoleon mounted a counterattack designed to cut off the Russians. Bennigsen managed to avoid entrapment and the two sides fought the Battle of Eylau on 7 and 8 February 1807. After this indecisive bloodbath both sides belatedly went into winter quarters. In early June, Bennigsen mounted an offensive that was quickly parried by the French. Napoleon launched a pursuit toward Königsberg but the Russians successfully fended it off at the 