@GamerSeuss Like OlivePit said, City was level 0 and was abandonned since april. We were only two in guild and in my group when trying to declare siege but I dont think its an issue.

With my guild I am trying to declare Conquest at a nearby City. I have the 50 000 Gold in inventory and I see this image.

When I click on Proceed, nothing happens and money is still in my inventory. Its probably a bug, thanks for your support !