Frederick II of Prussia had won the bloody
Battle of Prague against Austria on 6 May 1757 and was
besieging the city. Austrian Marshal Daun arrived too late to fight, but picked up 16,000 men who escaped from the battle. With this army he slowly moved to relieve Prague. Frederick stopped the bombardment of Prague and maintained the siege under
Duke Ferdinand of Brunswick, while the king marched against the Austrians on 13 June along with
Prince Moritz of Anhalt-Dessau's troops. Frederick took 34,000 men to intercept Daun. Daun knew that the Prussian forces were too weak to both besiege Prague and keep him away from Prague for a longer time (or to fight the Austrian army reinforced by the Prague garrison), so his Austrian forces took defensive positions on hills near
Kolín on the night of 17 June. At noon on 18 June, Frederick attacked the Austrians, who were waiting on the defensive with a force of 35,160 infantry, 18,630 cavalry and 154 guns. The battlefield of Kolín consisted of gently rolling hill slopes. Frederick's plan was to envelop the Austrian right wing with most of his army. Along the Austrian lines (Prussian right wing and center) he kept only enough troops to hide the concentration on the Prussian left wing. The Prussian main force would turn right toward the Austrians to attack their right flank. The Prussian left wing would locally outnumber the Austrians. After the Austrian right wing was defeated the battle would be decided. ==Battle==