The first episode of “The Civil War” by Ken Burns will debut on the free PBS for iPad and PBS App for iPhone and iPod Touch on Thursday (March 24), 10 days before the entire film is shown on the air. The rebroadcast honors the 150th anniversary of the start of the Civil War. The series will air nationally on PBS from 8 to 10 p.m. Eastern April 3-7 (check local listings). The first episode will also be streamed on PBS.org, April 4-10. The Civil War attracted an audience of 40 million during its premiere in September 1990, and established Burns as a star documentarian.