Enemy " wall , barrier " , how can I destroy it ?

Hi
How do I destroy , get passed or around an enemy wall, barrier , fence ?

You can not. If you are doing one of the coop adventures (settlersonlinewiki.eu/en/adventures/cooperation/) you need the other player(s) to clear out there sector.

Thank you .

on some non coop adventures there might be barriers, usually you need to read the quests to see what objectives you need to achieve to either get rid of the barrier or what items to make in provisionhouse to get an item to remove the barrier

And there is some addy, where you need to destroy those and you attack it with general, dont remember if its event one or something, but remember there were like 9 barriers and I had to sent 9 attacks on them, so always read what the quests ask you to do.