The historical refight. In some scenarios you are actually re-fighting a historical battle. In this case it is likely that the battlefield will already be mapped out for you. For a historical refight all you need to do is use your own collection of terrain to represent the historical battlefield as closely as possible.
Setting Up Terrain – Method 3
Source: Core Rulebook 3E, p. 124
For a historical refight, terrain is set up to represent the real historical battlefield as closely as possible.