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Also, a berserker can be very helpful during a castle siege. If you block the gate with a level 1 unit to prevent anyone from exiting and cast a spell (if you have a fire magic expert), which I always try to develop, on half of the enemy troops, then the warriors that arrive (1-2 squads) will face your entire army, except for the units holding the door. However, in this case, it would be good to have a controllable catapult, as there is little space in the castle, and it is difficult for the enemy units to disperse from the fire magic expert berserker.