I've played this game off and on for over 10 years (it originally came out in 2001 and was at the time, en epic MMORPG but always had its issues.
It is, hands down, the BEST WWII sim on the interwebz.
You can play on a free account on an unlimited basis (but will have limits as to unit/rank/weapons/vehicles).
You do need a fairly stout PC.
But give it a try.
http://www.battlegroundeurope.com/
My game name is 'tazzer' so if you feel the need to sent some digital lead, HE or AP my way, that's who you need to look for.