To the north of Dresden, as Napoleon appeared to be engaged, looking elsewhere, Blücher brought his troops south, toward the city. Realizing the danger, Napoleon directed his main army north again, to repel the Prussians; as he did so, the wiley Blücher withdrew. Other portions of the French army had comparable difficulties. Marshal Oudinot was repelled by Bernadotte at the Battle of Großbeeren, and MacDonald, near the Bober river. Furthermore, Napoleon began to suffer from illness, referred to variously as a colic or fatigue.