City Walls
Cities & KnightsCATAN
A city wall adds 2 to the number of cards you may keep when a 7 is rolled. You may have at most 3 city walls at a time, and a city can hold only one. A wall costs 2 brick; if a walled city is pillaged, the wall returns to your player area.
Also answers
can a city wall protect me from discarding cards on a 7city walls protect from discardingdo city walls protect me from a 7city wallscity wallhow do city walls workbuild a city wallhow many city wallswalls protect from the robberwalls and discarding