To traditionally lay siege to a town, armies would surround it, cutting off all supply routes to prevent food and reinforcements from getting in. They would often build fortifications, like trenches or walls, to protect themselves while they conducted bombardments with artillery. This prolonged method aimed to weaken the town's defenses and morale over time, ultimately forcing a surrender.
An army would want control of a town like Savannah for several reasons. First, it could serve as a strategic location, providing a base for further military operations in the region. Second, Savannah's ports and waterways could facilitate trade and supply lines, which are crucial for sustaining an army. Lastly, controlling a town could help the army exert influence over the surrounding area, ensuring stability and reducing the likelihood of resistance from local populations.