Answer:
He did not improvise or change.
Step-by-step explanation:
The Battle of Fredericksburg happened during the Civil War in December 1862 in Fredericksburg Virginia.
Major General Ambrose Burnside was the commander of the Union Army of the Potomac. He planned to surprise the Confederate Army and win by attacking the Confederates on two sides.
But Burnside was unable to adapt to the circumstances and improvise, the Union Army was unable to organize, this delay made possible for the Confederates to move in reinforcements.
In the end, the Union lost the battle, even though they had 120 thousand men, they had 12 thousand men killed or injured.