Vampires and Pumpkins

1)Its not really clear to me how many maximum troops can Vampires and Pumpkins get.
So have many it would be for each of them if id have got 20 territories or 30 with 1st army capacity upgrade?
2)how does attack and deff bonus work? do they work only if was thrown more then 20?
Sorry for my bad English and ty for answers.
So have many it would be for each of them if id have got 20 territories or 30 with 1st army capacity upgrade?
2)how does attack and deff bonus work? do they work only if was thrown more then 20?
Sorry for my bad English and ty for answers.