"Polish Thermopile". How Volunteers halt the Horse Army

**Fight at Zadwórz from 17 VIII 1920, which was fought by Polish volunteers with russian cavalry, is present referred to as "Polish Thermopil". Many Polish historians and publicists attribute large importance to the clash – stopping the 1st Horse Army march of Semyon Budionny to Lviv and thus saving the city. Is that truly what happened?**