George William Brown, the city council, and the new police commissioner, George P. Kane, and members of the Maryland General Assembly along with several newspaper editors and owners. Francis Scott Key's grandson, Francis Key Howard, was one of these political detainees. Some of the cells used still exist and can be visited at the fort. Fort McHenry also served to train artillery at this time; this service is the origin of the Rodman guns presently located and displayed at the fort. On 25 May 1861 John Merryman was arrested in Baltimore County and imprisoned in Fort McHenry. Merryman had had a role in destroying bridges in Maryland to impede the movement of Union troops. Merryman petitioned Supreme Court Chief Justice Roger B. Taney for a writ of habeas corpus, and Taney granted the petition, demanding that Merryman appear in his courtroom the next day and sending U.S. Marshals to the fort to enforce the ruling. A famous and dramatic standoff then occurred at the gates of the fort between the Federal Marshals and General George Cadwalader, the commander of Union troops of the Fort. The commander refused to comply with the order on the grounds that he was acting under orders from President Abraham Lincoln, who had suspended habeas corpus. The court case, Ex parte Merryman, remains unresolved, and the Executive Branch continued to refuse to comply with Taney's ruling. 20th century World War I During World War I, an additional hundred-odd buildings were built on the land surrounding the fort in order to convert the entire facility into an enormous U.S. Army hospital for the treatment of troops returning from the European conflict. None of those buildings remain, while the original fort has been preserved and restored to essentially its condition during the War of 1812. World War II During World War II, Fort McHenry served as a Coast Guard base. Used for training, the historic sections remained open to the public. National monument The fort was made a national park in 1925; on August 11, 1939, it was redesignated a "National Monument and Historic Shrine", the only such doubly designated place in the United States. It was placed on the National Register of Historic Places on October 15, 1966. It has become national tradition that when a new flag is designed it first flies over Fort McHenry. The first official 49- and 50-star American flags were flown over