'Battlefield 1 In the Name of the Tsar' is the most "extensive" expansion the game has seen, according to PlayStation.
Battlefield 1
The expansion is officially launched in September and in a new blog post previewing its arrival, Sony has revealed it will see the massive Russian Army join the fight.
The blog post read: "You'll get to experience some of the most dramatic battles involving the Russian Empire during World War I.
"We've also got six new maps coming as the fight moves to the Eastern Front and the ensuing Russian Revolution. Set against the harsh winter, these were some of the most brutal conflicts of the war. And these maps will prove it!"
The expansion also features the addition of 11 Russian-themed weapons, which includes the Mosin-Nagant M91 and the Russian Standard 1912 grenade.
The blog post continued: "The massive Ilya-Muromets Heavy Bomber will rain devastation down from the sky, but you'll be able to defend your positions from a unique stationary weapon: the powerful coastal gun battery.
"You'll also get the chance to execute incredible cavalry charges with the legendary Hussar riders using their awesome lances and an evolved set of cavalry moves."