Assault Gun - Free wargame rules for miniature wargaming WW2 large-scale battles. In Assault Gun, one unit is typically either an infantry regiment or a battalion, such as tanks. This means that a large, recognisable, action of WW2 can be fought in a day with a manageable number of units.
There are several orders of battle (oobs) covering units of armies, corps and divisions; and there are (presently) two full tested scenarios: Wintergewitter (Manstein's attempted relief of Stalingrad) and Kasserine Pass. The rules are included in the files section and are absolutely free to download. The messages are to discuss aspects of the rules.
(The picture is the British 7th Armoured Division in Operation Compass 1940)