Why did sherman and his army completely devastate the land?

Under the leadership of US General Grant, General Sherman's task was to end the Civil War as quickly as possible. Sherman's march to the sea had two major purposes:

A. Destroy all Confederate assets that could be used against the Union;

B. This included railways and supply depots;and

C. Demoralize the South by using relentless force to terrorize the Southern population, with the intent to have the Confederacy realize there was no hope in winning the War.