Final answer:
Union retaliation for Confederate war crimes is exemplified by Sherman's March to the Sea, where General Sherman's troops caused widespread destruction from Atlanta to Savannah to undermine Confederate morale.
Step-by-step explanation:
An example of Union retaliation for Confederate war crimes is Sherman's March to the Sea. This military campaign was led by Union General William Tecumseh Sherman, who sought to demoralize the Confederates by capturing Atlanta and then proceeding with a destructive march from Atlanta to Savannah. This march included the burning of barns, the destruction of crops, and the looting of homes. The ultimate fall of Savannah to Union forces was considered a significant blow to Confederate morale and was referred to by Sherman as a Christmas gift for President Lincoln. Throughout his campaign, Sherman's forces left a path of destruction, aiming to break the will of the Confederates to continue the war.