Question about fog of war

[ioticus]

Alneyan said:
It represents both. On a related matter, if you besiege a castle, you will need a spy (or an equivalent unit) to get a report on the defenders (a scout may be enough though); you will not get any automatic report.

So you're saying you can automatically see what's inside a fort unless you're besieging it, in which case you need a scout or spy?