Kings in retirement scenario

[Debotime12]

Hey there been playing for about  4 months know and just played the scenario  Kings in retirement  and i came out with a minor victory  was able to take the church  and preserve the chateau   but man did i take a beating clearing the buildings out  by the time i got my infanrty    up the the chateau   mt tanks where out of ammo and  the infantry got pretty beat up  clearing the buildings so i was able to hold OBJ on but not to advance to clear the infantry out any tips     on a diffrent approch  ETC on clearing bulding i would normal try and supress athen with another squad  assulat  the building next    to it but i was take heavy casualties   and would be repeled. I felt it was a very tough mission? any tips