1. The Second Schleswig War (1864): This war was fought between Prussia and Austria against Denmark over the duchies of Schleswig and Holstein. Prussia and Austria were victorious, and the duchies were ceded to Prussia.
2. The Austro-Prussian War (1866): This war was fought between Prussia and Austria over control of the German Confederation. Prussia was victorious, and Austria was forced to cede the duchies of Schleswig and Holstein to Prussia. Prussia also annexed several other German states, increasing its size and power.