Prince Charles then discovered that Frederick had failed to occupy the Graner-Koppe, the hill north of Burkersdorf (Střítež, Trutnov District, modern day Czech Republic) that dominated the landscape to the east and south.
At the action of Soor (Burkersdorf) on 28 June, he distinguished himself greatly, and at the Battle of Königgrätz where he led the advanced guard of the Guards Corps, his energy and initiative were still more conspicuous.