To the Germans, it was Operation Fruhlungswachen. For the Soviets, it was the Battle for Lake Balaton. For the western allies, it was, evidently, a minor skirmish. US history books say that the Battle of the Bulge was the last German offensive of WWII, but this is tunnel vision. Fruhlungswachen was just as ambitious and perhaps even more desperate, but was erased from Western history because it doesn't fit their narrative. The purpose of Fruhlungswachen (Awakening of Spring in German) was extremely ambitious. The idea was first to relieve pressure on Vienna and Prague. Second, it was hoped that they could get back into Budapest and re-establish what was their last ally--Hungary. The German High Command also hoped to encircle a huge Soviet Army south of Budapest as well. Finally, the last oil reserves of the Axis (which really only included Germany at this point) were South of Lake Balaton.