Heavy cruisers are a type of warship that were primarily used by navies during the early to mid-20th century. They are larger than light cruisers and are designed to engage enemy ships and provide support for battleships. Heavy cruisers typically carry a main battery of large-caliber guns, usually between 8 to 10 inches in diameter, allowing them to deliver powerful firepower. These ships played significant roles in naval battles during World War II, often serving as flagships for task forces. Notable examples of heavy cruisers include the USS Indianapolis and the HMS Exeter. Their design focused on a balance of speed, armor, and firepower, making them versatile assets in naval warfare.