Originally built in colonial times to protect New London harbor from British attack, Fort Trumbull is one of the 42 forts that defended the early United States coast and harbors. The only combat in the forts history occurred on September 6, 1781 when it was attacked by British forces under the command of the infamous Benedict Arnold. Over the years, Fort Trumbull has served as the location of various military forts, schools and research facilities for the United States Army, Coast Guard and Navy. In the late 1990s the fort was restored to its original state, and in 2001, it opened its doors to the public as a state park. Today, the former officers headquarters houses a visitors center where guests can view interactive exhibits, short films and 3-D models to learn about 225 years of military history and technological advances from the Revolutionary War through the Cold War. In addition to the historic fort and interpretive museum, the park features two piers offering ample fishing opportunities and docking for vessels. Pets on a leash are permitted in the park. They are not allowed inside buildings, including the fort, or on the fishing pier.