The scene is from the battle of Poltava 1709. The action take place at the Swedish fortifications out side of the town Poltava, not on the main battlefield.
The three Russians and the Swedish cavalry officer are made by Swedish company Digital Sculpt.
The wounded Swedish soldier and ALL other details on the ground are scratched. (Except for a rifle and Hornet head and hands on the wounded Swede)
Cheers!