Final answer:
The British had the most victories in the southern coastal towns during the Revolutionary War, specifically capturing Savannah in 1778 and Charleston in 1780. However, their inland advances were countered by American forces, eventually leading to the British surrender at Yorktown in 1781.
Step-by-step explanation:
The question pertains to the Revolutionary War in the West and South during the period of 1778 to 1781 and identifies the areas where the British had the most victories. Based on the provided text, evidence can be found in the 'Southern Strategy' which indicates that the British had significant successes in the southern coastal towns, including the capture of Savannah, Georgia in 1778, and Charleston, South Carolina in 1780. These victories granted them control over two major southern ports. However, these successes did not translate into definitive control inland, as American forces effectively countered further British advances. The ultimate failing of the British strategy in the south culminated with their surrender at Yorktown in 1781, marking the end of large-scale battles in the American Revolutionary War.