To carry out punitive raids on the farms and railroads that supplied the Confederate armies in the field.
He saw that he and his army could live off the land (following a good harvest) and become less dependent on their long and vulnerable supply-line.
When they reached the sea, they could liberate the blockade-runners' port of Savannah, depriving the South of further war supplies.
Sherman's March to the Sea
1864
savannah
That is called Sherman's march to the sea.
The March to the Sea
Sherman's March to the Sea
Savannah
1864
March to Sea
Savannah
savannah
From Atlanta to Savannah
Georgia
no one
1864
Georgia
The "March To The Sea"