On 16 August, Napoleon had sent Marshal Saint-Cyr's corps to fortify and hold Dresden in order to hinder allied movements and to serve as a possible base for his own manoeuvres. He planned to strike against the interior lines of his enemies and defeat them in detail, before they could combine their full strength. He had some 300,000 men against allied forces totaling over 450,000. But the Coalition avoided battle with Napoleon himself, choosing to attack his subordinate commanders instead (see the Trachenburg Plan). On 23 August, at the Battle of Grossbeeren, south of Berlin, Crown Prince Charles of Sweden (formerly French Marshal Bernadotte, Napoleon's own Marshal) defeated his old comrade Marshal Oudinot. And on 26 August, Prussian Marshal Blücher defeated Marshal MacDonald at the Katzba