Steam now offers downloads of the Darkest Hour: Europe '44-'45 modification for Red Orchestra: Ostfront 41-45, Tripwire Interactive's World War II shooter. The mod includes 11 new maps, new weapons, new vehicles, and new features, along with American, British, and Canadian troops as it takes Red Orchestra away from the Eastern front and into the invasion of Normandy, Operation Market-Garden, the Battle of the Bulge, and more. The free add-on requires Red Orchestra, which is on sale for $4.99 through this weekend.