I still don't know what to do. I tried to make the alpha layer invisible with Adobe Photoshop and the RGB layer visible, but I don't know how. Here are some screenshots so you know exactly what I'm talking about.

Here I'm showing the city with the blank banner and the faction symbol which is set to the saxons symbol.




Here are the black banners and textureless soldiers on the battlefield, which I don't know how to fix either.



I hate to be so stupid... but once I learn how to do this once I'll never forget.

Thanks.