You must be strong! Barbarians attack the weakest targets, and the victim of their onslaught will be the player who contributes the least to the defense of Catan. Don't take any chances! Field your knights!
Eureka! Oil has been discovered on the island of Catan. The great engineers of Catan have learned ways to improve production using this valuable new resource, both by converting it into other resources and enabling the upgrade of cities into metropolises.