Catan: Cities & Knights Expansion (2015)

Use the hexes of the Catan base game to assemble Catan within the provided frame. Each player has just built a settlement and a city, when dark clouds gather over the peaceful island of Catan. Wild barbarians, attracted by the wealth of Catan, sail toward the island's shores. There is still enough time to prepare for confronting the intruders, though. The strength of the hostile barbarian army always corresponds to the number of cities on Catan. In order to successfully defend Catan, the knights of all players combined must be at least as strong as the barbarian army.

Knights are not being used in the form of cards; instead, they are represented by wooden tokens that are placed on free intersections. Each token has an “active” side depicting a black-and-white knight helmet and an “inactive” side depicting a knight helmet in color. A knight can only fight after he is activated; activation costs one grain. After paying said grain, the player turns the knight token over to its active side. Each ring on the token counts as one strength point.
If the knights of all players combined have enough strength points to defeat the barbarian army, the danger is averted for the moment. However, if the Catanian knights are too weak, a city will be raided and downgraded to a settlement.
This unfortunate event always affects the player who contributed the least amount of knight strength. Besides defending Catan, knights can also be used to chase away the robber or to displace another player’s knight.