Confederate forces defeat Union forces during the Battle of Kennesaw Mountain during the Atlanta Campaign.

The Battle of Kennesaw Mountain, fought on June 27, 1864, was a key engagement during the Atlanta Campaign in the American Civil War. Union forces under Major General William Tecumseh Sherman faced off against the Confederate Army of Tennessee led by General Joseph E. Johnston. As Sherman pushed his way toward Atlanta, he encountered entrenched Confederate forces along the rocky ridges of Kennesaw Mountain in northwestern Georgia. Instead of continuing his usual tactic of flanking maneuvers, Sherman opted for a rare frontal assault. This decision was likely driven by a combination of political pressure for quick results and frustration with Johnston’s continued withdrawals.

The attack proved costly for the Union. The Confederates, well-fortified and occupying higher ground, inflicted heavy casualties—approximately 3,000 Union losses compared to roughly 1,000 Confederate. Despite this tactical defeat, the battle didn’t stop Sherman’s momentum. After Kennesaw, he resumed his flanking strategies, eventually forcing Johnston to retreat further toward Atlanta. Strategically, the battle underscored the difficulty of breaking fortified lines through direct assault, a lesson reinforced throughout the Civil War. It also demonstrated Sherman’s adaptability—while the attack failed, his ability to pivot back to his original operational style helped maintain overall Union progress in the campaign.