If they are in a defensive position, 200 soldiers should be able to hold off 500 enemy without much difficulty until reinforcements arrive.
Does anyone remember the Alamo? The odds were about 10-1, and the Texans held off the Mexicans for almost two weeks. The Iraqi army can bring in reinforcements in a matter of days.
“The Iraqi army can bring in reinforcements in a matter of days.”......
And the American air military could wipe the entire group of ISIS attackers off the face of the earth in a matter of minutes. Where would they be able to hide in that desert country, NO PLACE. (Get in done).
200 soldiers should be able to hold off 500 enemy without much difficulty
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The refinery is approximately 3 miles long and one mile wide. Evenly spaced, those 200 would need to be spaced over 200 feet apart to cover the whole perimeter.
https://www.google.com/maps/@35.008346,43.502083,2654m/data=!3m1!1e3