I think its a very realistic mission and campaign. You are commanded at battalion, regiment and divisional levels by sheer incompetents who can't arrange for you to attack on favorable ground, with coordinated companies and adequate artillery preparation from the start and with adequate resupply. I don't think that that was that uncommon in the initial period after the landings. More seriously though, the mission is bloody but doable, and there are a number of historical posts on how to achieve it.. Darkness and then smoke are your friends. The enemy AT assets must be spotted and eliminated and then your tanks are key.