Once saw a 4 ship of A-10 fending off 4 F-15C's. The A-10s set up in the bottom of a valley in a defensive circle.
The 15s were circling about 10,000ft above. Occasionally pitching in but breaking off soon as a A-10 further round the circle would pitch up against it. Funny enough the 15s didn't seem to like seeing the front aspect of an A-10.
They didn't seem to get much joy and pushed off.
Might usually be seal clubbing but if the fighters are seen in time it might be a different story.