In no game except Heritage does the player directly control any individual settler - instead, the player issues general orders, with the AI handling the delegation to specific settlers. In Heritage of Kings, the player can directly control serfs, such as ordering them to chop down trees in a particular location, or scout unexplored territory. Workers, however, cannot be controlled. In The Settlers, The Settlers II, Rise of an Empire, and Paths to a Kingdom, as the player constructs buildings and thus requires settlers to occupy them, the settlers are automatically generated as needed. In The Settlers and The Settlers II, as the settlement continues to grow in size, the quota of settlers will eventually be reached, and the player will need to build a warehouse to generate more settlers. In Rise of an Empire and Paths to a Kingdom, once the settlement's quota has been reached, new settlers can only generate once the player has increased living space, either by building new residences or upgrading existing ones. In both The Settlers III and The Settlers IV, new settlers aren't generated as needed; instead, a set number is added to the player's pool upon the construction of residences. In Heritage of Kings, the player manually recruits serfs as needed. Once the serfs have constructed a building which requires workers, those workers will automatically emerge from the village centre and occupy the building. Once the settlement's quota has been reached, the player must either upgrade the centre or build an additional one. In the first two games, an important game mechanic is the construction of a road network so as to allow for an efficient transportation system, as any settlers transporting goods must use roads. To maximize distribution, the player must set as many flags as possible on each road. Flags can only be set a certain distance apart, and serve as transport hubs; a settler will carry an item to a flag and set it down, at which point the next settler along will pick up the item and continue, freeing the first settler to return and pick up another item at the previous flag. A major change came in The Settlers III, where roads were no longer necessary, and settlers could walk freely around the player's territory, with the AI handling pathfinding. Aside from The Settlers II (10th Anniversary), roads were not a requirement again until Paths to a