Hi Quantum,

You use a complement system. You complement agent and structures with each other to aid your armies.

Watchtowers can's see other spies, assassins and exact army composition & numbers.

Diplomats can't determine exact army composition and numbers, but they can negotiate.

Spies can see ALL! At closer distance only the spy can determine exact army composition and numbers. Your army can also do this once they are in the enemies' Red Zone (but at that point, you are stuck and you won't be able to use any movement points). Assassins and other spies are also harder to see. The spy will have to bump close to the person to spotthem.

Personally, I use 1 spy, and 1 diplomat per Army. (Assassins I don't use much if I ever use them at all, due to their very high upkeep of 200 denari per turn).