Kingdom Wars Online is an 3D Free to Play Real-Time Strategy MMO Game MMORTS featuring real-time siege combat including both singleplayer and online game modes
http://mmoraw.com/index.php?option=com_content&view=article&id=1351:kingdom-wars-online&catid=4:real-time-strategy-mmorts&Itemid=5
http://store.steampowered.com/app/227180/
http://kw.reverieworld.com
http://mmoraw.com