It is late November 1863. You are photographer David Bachrach. You are finally home in Baltimore after photographing President Abraham Lincoln speaking at the dedication of the Union cemetery at Gettysburg. When you immigrated to the US from Germany, you never imagined you would photograph the president of the United States! The president's words reminded his audience why we're fighting this war to preserve the Union. You think the speech was not that great. Others agree with you.
The speech was very brief so you captured only one shot of Lincoln. You are about to develop the film in your cellar when you discover it has flooded. You know one person in the area with a darkroom for developing film. Unfortunately, he is a Civil War buff and only allows people to use his darkroom if they know three Civil War date codes and three letter codes.
Study the Civil War, figure out the codes, and document the Gettysburg Address!