OpenRA, Command & Conquer: Tiberian Dawn; GDI, mission 2: Knock Out The Refinery

Global Defense Initiative's second mission. Slightly more micro required, and I think the engineers were able to capture a building apiece in the original, rather than requiring two per building in OpenRA's version, though my memory isn't the best. It would seem fitting for them to be so able however, so it probably was like that anyhow. They have been nerfed, and one must herd them carefully.