4-Mercy at Appomatto v. Appomattox Wimer Mclean's house was also used on April 10th for the surrender Commissioners meeting, and McLean's house over the next few days as the Headquarters of Major General John Gibbon, U.S.A W BTL E The end of mclean's houseW B T L E Wilmer McLean's house was also used on April 10th for the Surrender Commissioners meeting, and over the next few days as the Headquarters of Major General John Gibbon, U.S.A. McLean’s house V. Appomattox The end of McLean’s house. Lesson 14 – Mercy at Appomattox