The Civil War Trust is rolling out its latest in a series of Battle Apps for smartphones.
The Appomattox Battle App culminates with the surrender of the Army of Northern Virginia on April 9, 1865.
The nation's largest nonprofit battlefield preservation organization says more than 110,000 users have downloaded the 10 titles. The apps are intended to enhance a visitor's experience at Civil War sites.
They include GPS-enabled maps for self-guided tours, chronologies, facts pages, and trivia challenges.
The trust's president, James Lighthizer, says the apps are a great source for armchair travelers, as well.