Originally posted by zizi666:

i've seen images where people use gates to cross a moat. You can walk across a closed gate and when you put enough next to each other you can even wheel a cart across. Open the gates and nothing can move across.

Fairly new to the game, just a few days but my immediate reaction to the invasions was to build a moat and a gate with pole fence at the top of the moat.

Closed it up with a gate with a roof on top of it to avoid it getting that rotten color. I assume wood eventually breaks if weathered too much? Only gotten graydwarves and animal invasions though.