From August to November 1918, the Allied powers won many battles. This was called the Hundred Days Offensive. What happened after the Hundred Days Offensive?
Russia joined the war again. The United States Congress decided not to send any more soldiers to Europe. Germany surrendered to the Allied powers. The Allied powers started to lose a lot of battles.
The Hundred Days Offensive was a turning point in World War I. In war, an offensive is a large attack. After the Hundred Days Offensive, Germany surrendered to the Allied powers. The war was over.