Also , I wish Will had drawn the rock . <| sep |> They are correct . You need 2 strategic resources to allow you to build units in any city . For cities with Encampments , you only need 1 of that strategic resource instead of 2 . If the strategic resource gets pillaged , you will of course lose access to that resource until it is repaired . This can be used offensively against an enemy Civ , you can pillage an enemy horse , and if they have no more access to horses , all their units that require horses to build will no longer heal . can refer to the official Civ 6 PDF and look at page 54 STRATEGIC RESOURCES Strategic resources are not always visible at the start of the game they may require knowledge of a particular technology before they appear on a map . For example , researching the Bronze Working technology will reveal Iron on the map . Strategic resources allow you to build certain units . When you construct an improvement on a strategic resource hex , it provides you with that resource . To produce a strategic resource unit in a city , the player needs 2 of the resource . If the city has an appropriate military district Encampment for land units , Harbor for sea units , Aerodrome for air units , the player only needs 1 of the resource . To purchase a strategic resource unit , the player needs 2 of the resource . You can see how many units of each strategic resource you have available on the top of the main screen .