Catan Cities & Knights Expansion by Klaus Teuber

Trouble is brewing off the shores of Catan. Though your thriving communities have begun to grow into majestic cities, your success and wealth have caught the attention of marauding invaders. To ensure the collective security of the island, you must stand together and muster and army of the bravest knights. Maintaining an army while also advancing your society is no simple task, but the greatest leaders thrive on a good challenge. Huzzah!