Final answer:
The 'Spring Offensive' during World War I was the Ludendorff Offensive, aimed at breaking through the Allies' lines on the Western Front before American forces could fully engage. It started in March 1918 but ultimately failed.
Step-by-step explanation:
Spring Offensive of World War I
The German offensive known as the "Spring Offensive" in WWI was called the Ludendorff Offensive. This series of attacks, also known as the Kaiserschlacht (Kaiser's Battle), commenced in March 1918, seeking to break through the Western Front and force the Allies to the negotiating table before the full force of American troops could be deployed. Despite early successes, the offensive ultimately failed to achieve its strategic objectives and exhausted German resources, contributing to Germany's eventual defeat.