Battle of Kursk

On July 5, 1943, the Battle of Kursk began. The next day 25,000 Germans were killed. An excerpt from the article:

"The Battle of Kursk occurred in July 1943 around the Soviet city of Kursk in western Russia, as Germany launched Operation Citadel, Hitler’s response to his devastating defeat by the Soviet Red Army at the Battle of Stalingrad. The battle was Germany’s last chance to regain dominance on the Eastern Front during World War II and would be their final blitzkrieg offensive.

Despite a massive planned assault on Soviet troops using heavy tanks, artillery and air power, postponements by German dictator Adolf Hitler gave the Soviets ample time to prepare for the onslaught. Ultimately, Germany’s plan to wipe out the Red Army once and for all failed, but not before both sides experienced heavy casualties."