Land Batteries have a different meaning depending on what Era one means. In 15th Century (onward), they came to mean any semi-fortified position (near water) – by which Cannon could engage enemy Warships or other assets. Unlike a Coastal Fort (or related structure) – Land Batteries were NOT heavily fortified positions. They were normally depressions in the earth with breastworks or other types of medium protection. Later (in the 19th and early 20th Centuries) – Land Batteries had concrete reinforcement “curtains”.