Planned by Brigadier General Irving Morrell, the operation drove the Confederates out of Pennsylvania. It took place in the aftermath of Morrell's barrels attacking the Confederate forces around Pittsburgh. U.S. forces had been able to completely encircle the city, trapping the C.S. soldiers inside. Confederate PresidentJake Featherston, who ordered the attack on Pittsburgh, refused to order his troops to immediately retreat from the city, as he was convinced his forces could be supplied by air. However he did send a relief force to the city.
Morrell ordered U.S troops in Indiana to attack the western side of the C.S. corridor from Kentucky to Lake Erie while forces under his direct command held the line surrounding the trapped CS Army in Pittsburgh. Both groups converged on the C.S. troops in northern Ohio and compelled the C.S. relief force to turn back to defend the depleted corridor. The Confederates in Pittsburgh were forced to surrender and Operation Rosebud was an overwhelming success. The Battle of Pittsburgh was over.