Leveling Engineering quick

1. siege town
2. build trebs, once they build immediately click on them and send to reserves.
3. build catapults, once they build immediately click on them and send to reserves.
4. place all trebs at once and just let them destroy the enemy walls and siege engines.
   4b. if a treb somehow goes down replace with a catapult.
5. once walls and enemy engines are down make sure every slot is filled with trebs or catas and attack.
6. have all your troops as far back as possible in shield wall formation so enemy can't ranged attack them.

7. shoots catas at the crossbow men at the walls and trebs a little past the broken walls. (trebs shooting past broken walls usually gets more enemies each hit)

controls = A and D turn left and right, W and S change the range.

you can retreat and attack again for more ammo and enemies should go back to their spots.

Here is how much i level'd after 1 siege.