The Old Tiger

This mission can be frustrating. At the start, you have limited resources to overcome an unlimited stream of foes. On top of that, you have 3 heroes which cannot die, lest you forfeit the mission. You cannot make new units, and you have to besiege a number of castles while fighting archers that will try to kite you, all while protecting the king as he moves from one meditation point to the next.

You'll have enemies coming at you from all sides, and you cannot devote the time to a slow and careful approach. It requires decent micro-management skills, while also bringing all your military forces to bear on the problem.

Your army is split into 2 groups initially. One by sea, and one by land. It is possible to merge these two forces around the second meditation point, and it can be considered wise to do so. Proceed carefully, don't let your heroes get lured away, or get left behind.

The Ratan Archers, and Elite Ratan Archers really show off how powerful and annoying then can be in this mission. Be careful, and move quickly.