On November 13, 2001, President George W. Bush issued a military order to provide for the detention, treatment, and trial of those who assisted the terrorist attacks on the two World Trade Center buildings in New York City and the Pentagon on September 11. In creating a military commission (tribunal) to try the terrorists, President Bush modeled his tribunal in large part on a proclamation and military order issued by President Franklin D. Roosevelt in 1942, after the capture of eight German saboteurs. This report describes the procedures used by the World War II military tribunal to try the eight Germans, the habeas corpus petition to the Supreme Court, and the resulting convictions and executions. Why was the tribunal created, and why were its deliberations kept secret? How have scholars evaluated the Court's decision in Ex parte Quirin (1942)? The decision was unanimous, but archival records reveal division and disagreement among the Justices. Also covered in this report is a second effort by Germany two years later to send saboteurs to the United States. The two men captured in this operation were tried by a military tribunal, but under conditions and procedures that substantially reduced the roles of the President ...