Düppeler Schanzen
During the war, Frederick joined the Prussian army and was part of the fighting under the command of Field Marshal Friedrich von Wrangel. He distinguished himself with his courageous valour in the Battle of Dybbøl (7–18 April 1864) that marked the defeat of Denmark by the Austro-Prussian coalition. Pleased with the German victory, Victoria expected the military success of her husband would encourage people to understand that she was the wife of the heir apparent. In a letter to Frederick, she complained of the constant criticism and being considered too British in Prussia and too Prussian in Great Britain.