What was the last act of German aggression?

The last act of German aggression during World War II is often considered to be the launch of the Ardennes Offensive, also known as the Battle of the Bulge, which began on December 16, 1944. This surprise counteroffensive aimed to split the Allied forces and capture the critical port of Antwerp. Ultimately, it failed, leading to significant losses for Germany and marking a turning point in the war, as Germany was unable to mount further large-scale offensives afterward. The war in Europe would officially end with Germany's surrender on May 7, 1945.