when should you build a new fortress?

[fungalreason]

Originally Posted by Tifone

3 or 4? will it not hurt the resources of your capitol to build it so near?

I don't think you'll ever reduce the available resources as long as you don't build directly adjacent to the capital, if I understanding it correctly. (I'm assuming it hasn't changed since the manual was written).

Capitals are usually admin 50 / 60. Usually you'd aim to build your cheapest available option for the second fort. These generally have a low admin value (30 or less). If you put the second fort a minimum of 2 spaces away from the capital, then they are only sharing a few bordering provinces. Provinces without forts in them actually have double the available resources that are listed. The resources provided by the admin amount are actually calculated from that "hidden" total. The capital can only draw 50-60% of that amount. As long as the admin value of the capital + the admin of the fort is less than 100, each fort will be drawing the maximum amount of production from the adjacent territories.