"IS managed to control parts of the field," the Syrian Observatory for Human Rights, which relies on a wide network of sources in the war-torn country, said after yesterday's assault at Shaer, in Homs province.
An unknown number of jihadists were also killed, Observatory director Rami Abdel Rahman said.
An earlier attack by IS fighters on Shaer in July left 270 people dead, including soldiers and pro-regime fighters.
Most were reportedly executed at gunpoint after being taken prisoner.