Scores of dead ISIS terrorists litter battlefield in Deir Ezzor province .
Syrian Army troops launched surprise offensive targeting ISIS base in the outskirts of Al-Mayadeen city, east of Deir Ezzor province .
Military sources said that the ISIS jihadists infiltrated from their enclave in northern Deir Ezzor, to attack government positions in Al-Mayadeen.
The deadly raid comes a day after recent ISIS offensive on the vital oil pumping station of T3 near the city of Palmyra. however, their attack was completely foiled
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