Europe in Ruins is a modification for Company of Heroes that converts the game into a MMORTT. Units are purchased and managed on the backend website and transferred into the game for battle. After the battle, the units are automatically updated on the website, units lost are removed from your company, units surviving have their experience levels updated. Best of all, the modification does not affect your Company of Heroes or Opposing Fronts installation or your ability to play the original game with the modification installed!
There are many guides on the Europe In Ruins site. Regularly new players ask for things that are already written down in the forum. To prevent this I...