Seals from Tell Brak and Nabada dated to the pre-Akkadian kingdom, revealed the use of four-wheeled wagons and war carriages. Excavation in area "FS" recovered clay models of equids and wagons dated to the Akkadian and post-Akkadian periods. The models provide information about the types of wagons used during that period (2350–2000 BC), and they include four wheeled vehicles and two types of two wheeled vehicles; the first is a cart with fixed seats and the second is a cart where the driver stands above the axle. The chariots were introduced during the Mitanni era, and none of the pre-Mitanni carriages can be considered chariots, as they are mistakenly described in some sources.