1 how do I unlock the fourth team?
2 how do I enhance the tanks more?
1.) you can look your mission list ,
there was many Main mission ,
someone mission can unlock 4th team stock .
2.) when you strength your tanks ,
you can see a icon in the list os tanks ,
SPG can add firepower ,
HT can add armor ,
LT can add speed and scout ,
some rare tanks can add more states .
Also, when the stat is green, it means it can’t be enhanced any further.
Thanks both of you