Why was savannah better prepared for an invasion by sea than an invasion by land

From November 15 until December 21, 1864, Union General William T. Sherman led some 60,000 soldiers on a 285-mile march from Atlanta to Savannah, Georgia. The purpose of Sherman's March to the Sea was to frighten Georgia's civilian population into abandoning the Confederate cause.

In New York in November 1778 an army of more than three thousand British, German, and Loyalist troops. Clinton also ordered General Augustine Pre - vost to invade Georgia from Florida. General Prevost dispatched one army by sea and another by land. Savannah was not prepared to repel a large attacking force.