Armed & Ready
They called the cannons they had on the island Columbiads. While you might think they were enough, Fort Alcatraz also had caponiers. These were stone towers that added an extra level of defense. Enemies who thought of doing anything will have to get through a lot before they can cause severe damage.
The citadel finished construction after about a year. Next to the lighthouse on the island, they set up barracks. The lighthouse on Fort Alcatraz is the first-ever navigational light found on United States’ Pacific Coast. Many were impressed with the defense Fort Alcatraz had back then.