The allied force consisted of mostly French troops, supported by Sardinians and some Turks, that were positioned along the North edge of the Fedioukine Hills. The photo below gives an overview of the main part of the battlefield, with allies at the top of the map and the Russians at the bottom:
Off to the right, not shown above, are the Turks, the Sardinians can be seen in the background:
On the Russian right is Read's Corps:
The Tchernaya River was a deep wade, with difficult banks. There was also a second water obstacle; an aqueduct which ran parallel to the river. I have not included this using the river to represent the complete valley floor, as in reality there were also ditches and dykes. To reflect this the river will restrict movement, taking a complete turn to cross, except via the two bridges.
The hills are quite steep giving the defender higher up an advantage.
In the real battle the command and control of the Russian forces was poor, leading to a piecemeal attack before they were properly prepared. I will reflect this at the outset.