Round table

Did you mean guarding a neutral castle with elite troops?! - I think the city guard is generated randomly at the beginning of map generation.

Exactly :) But the question is, on day 7, there's only one or two stacks, and they're not upgraded. But the following week, an upgraded stack is added, but they aren't built in the castle. Or, for example, a swamp is often guarded by one basilisk. But, of course, basilisks aren't built in the castle.