Has germany ever won a war?

Germany has only existed as Germany since 1871, a year after the Franco-Prussian War, which Prussia ("Germany") won. Prussia, the head state of what became Germany has won several wars, including:

Great Northern War, 1st and 2nd Silesian wars, Seven Years War, War of the Sixth Coalition, Second War of Schleswig, Austro-Prussian War, Franco-Prussian War, World War 1 (on the Russian Front).