Thunder in the East, Russia at War 1877 and 1904 is an independent Age of Valor (AOV) expansion chapter or mini-module for Age of Eagles II, also known as Napoleonic Fire & Fury. It covers both the Russo-Turkish War of 1877 and the later Russo-Japanese War. As such AOE II is needed to properly play this game. In most cases all rules changes have been imbedded in the Data Charts as well as the charts and tables on the Quick Reference Sheet. All players need to do is use these new specifications or DRMs with the original rules, then play as normal. Any changes unique to the Russo-Turkish and Russo-Japanese Wars, the subject of this expansion set, are included for both the conflict overall, and the included battles of Plevna, Aladja Dagh, Telissu and Liao Yang scenarios. The AOV product line is sold primarily via a digital PDF distribution format, though a hardcopy version is available from certain retailers. It is 44 pages long