The story events covers the great historical battle of Al-Qadiseiya that occurred at Iraq in the 7th century.
The battle had a decisive outcome that lead to the collapse of the Sassanian empire.
It lasted for approximately a week but the current game content covers the events prior to the battle.
You play as two elite soldiers who happen to be also brothers.
The twist is the army commander got sick and delegated his command to his elite soldier to lead the army.