Kolin 1757: Frederick The Great's First Defeat -

Although Prussian cavalry initially drove back an Austrian counterattack, they were later crushed by fresh Austrian cavalry reserves.

Sources for details include Wikipedia , Warfare History Network , and British Battles . If you’re interested, I can provide more info on: The tactic Frederick famously used How he recovered from this loss at the Battle of Rossbach Kolin 1757: Frederick the Great's First Defeat

Prussia lost the strategic initiative; for much of the remaining war, Frederick was forced to react to the moves of the anti-Prussian coalition rather than dictating the conflict. Although Prussian cavalry initially drove back an Austrian

Frederick’s plan relied on an oblique order attack to outflank the Austrian right wing. However, the execution failed due to several tactical errors: Warfare History Network