You should follow the rules . When you upgrade your town hall, there would be some weightage defences . It would effect in the mismatch of war
-for th7 the 3rd air defence
- for th8 the bomb tower
-for th9 the x bows
-for th 10 the inferno towers
-for th 11 the egal artilary
These means that first you should upgrade your offence tather than the deffences . And you should be able to clear a mirror of your town hall in war . And then you can upgrade deffences



