From EA Games:
Empires is a revolutionary mod for Battlefield 1942 combining first person action and real time strategy elements. Empires introduces buildable and destroyable buildings, a resource economy system, team commanders, and many other features modders of Battlefield 1942 have declared to be impossible due to no available SDK. With buildable/destroyable buildings, the uninspired point system of regular Battlefield 1942 play is eliminated, leading to fulfilling gameplay where victory is determined by strategy and teamwork, not spawn camping.
Each team gets their own command vehicle, which is capable of placing buildings and giving orders to players. However, to build anything, commanders will have to have the necessary number of resources first. Resource points can be found around the map and refineries can be built on them to mine their resources. Teams will learn that controlling these resource points is the key to victory.