U.S.-led coalition aircraft destroyed an estimated $11 million worth of oil and trucks over the weekend in the largest single airstrike this year against the Islamic State’s black market oil trade in Syria.

“You’re going to have multiple effects from this one strike,” Air Force Lt. Gen, Jeffrey Harrigian, commander in the Middle East, said Tuesday. “We’ll have to see what this does to their ability to generate fighters.”

Waves of aircraft destroyed 83 oil tankers sitting in the open in Sunday’s attack.

The attacks were ordered after a pilot spotted some vehicles gathering in Deir ez-Zor province, a key oil-producing region in Syria controlled by the Islamic State, also known as ISIS or ISIL.

The coalition command sent a surveillance aircraft over the area. The command then quickly directed A-10 attack planes, F-16s and two coalition aircraft, which together launched more than 80 weapons, including bombing and strafing runs, at the vehicles.

After the coalition bombing campaign began two years ago, militants have since learned to avoid concentrating their forces or supplies in the open to avoid airstrikes.

“This is a very good indication that they’re having trouble commanding and controlling their forces,” Harrigian told USA TODAY in a telephone interview from his headquarters in Qatar.

US-led forces executed the largest single airstrike of the year against ISIS' oil business

Read Next: US-led forces executed the largest single airstrike of the year against ISIS' oil business

Read more at MSN

Image courtesy of AP