ok, page 24 says "Cities the power dice are depicted on the Game board."
so in the image from page 19 it shows a city with: "6 x die of 3":
- is the city attacking with this, or defending?
There's no difference between attacking and defending in this game. This is the city's combat roll if you move onto it.
- 6 means 6 die rolls?
- and you hit on any of the 6 rolls of 3 or less would inflict a wound/hit?
and pg. 24 also says "Cities can have from zero to five wounds."...so how many "wounds" can the city on pg 19 take...6?
The dice don't have anything to do with how many wounds a city can take. A city can take as many wounds as it has towers (depicted on the board). The city on page 19 has a single tower, so it is defeated if it takes one wound (and your Necromancer survives combat).