ok this is just copy paste info, read it all and think about it first
balista are needed for zero losses, mechanics(balista/transporter/etc.) are not stopped by traps
2. RESOURCES/TROOPS/DEFENSE
NPC city resources are replenish each 8 hrs, A barb city will take approx 1 hour to regenerate all to full (10% of the full amount per 6 minute tick). A barb city will also immediately regenerate approx 18% of all lost wall units each time some are destroyed. Example: if you destroyed 1000 towers and hit it again 1 second later 180 towers will be back.
this link tells you what each level or barb has
https://2img.net/r/ihimizer/img166/1517/barbcityguide.jpg
(copied from ZORTHOX thanks)
3. ATTACKING
Attacking low lvl NPC cities are mainly for resource and gold, this is done with ballistas to achieve 0 loses. The maximum level without loses is level 5, level 6 or more have trebuchets so you will always suffer losses there.
But there are ARCHER TOWERS... so you need specific tech level of archery and Horseback Riding (HBR).
Archery 08 / HBR 03 (Massive losses due to being in tower range)
Archery 08 / HBR 04 (Smalls losses from units but @ tower safe range)
Archery 08 / HBR 05 (0 Losses )
Archery 08 / HBR 06 (0 Losses )
Archery 08 / HBR 07 ( Small losses )
Archery 08 / HBR 08 (Massive losses due to being in tower range)
Archery 08 / HBR 09 (Massive losses due to being in tower range.)
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