Mosfilm contributed more than £4 million of the costs, and nearly 17,000 soldiers of the Soviet Army, including a full brigade of Soviet cavalry, and a host of engineers and labourers to prepare the battlefield in the rolling farmland outside Uzhhorod, Ukrainian SSR. The battle sequences of the film include about 15,000 Soviet foot soldiers and 2,000 cavalrymen as extras and 50 circus stunt riders were used to perform the dangerous horse falls. It has been joked that Sergei Bondarchuk was in command of the seventh-largest army in the world. Months before the cameras started filming, the 17,000 soldiers began training to learn 1815 drill and battle formations, as well as the use of sabres, bayonets and handling cannons. A selected 2,000 additional men were also taught to load and fire muskets. This army lived in a large encampment next to the battlefield. Final costs were over £12 million (GBP) (equivalent to about U.S. $38.3 million in 1970), making Waterloo one of the most expensive movies ever made, for its time.