Answer:
He was defeated because of General John Bell Hood's orders on a frontal assault on strong union positions. Which was majorly from personal motives and objectives.
Step-by-step explanation:
The battle was for five hours, which is one of the most bloody in history. It involves the Union and Confederate soldiers. His enemy (The Confederates) were able to launch a counterattack on the union, he thought he had lost and ran away. At least six of the Confederacy's generals were killed in the battle, while others were severely wounded or captured.
He was defeated because of General John Bell Hood's orders on a frontal assault on strong union positions.