After seeing two hawks come together in the air and then disappear behind some trees, I found two Red-tailed Hawks (in a field behind the trees) locked together by their talon holds on one another. I was drawn to their location after seeing a third hawk, which had been at the top of a tree near their point of contact, fly down and land adjacent to the two hawks. One of the hawks was clearly the more aggressive and during their struggle used it's beak to strike repeatedly at the other's head and eyes. After I became convinced that the hawk on the bottom was going to lose an eye or suffer fatal injuries I finally gently nudged the top hawk with my shoe to try to break up the struggle. After a couple of minutes spent looking up at me, the hawks separated and flew off. The hawk that had been getting the worst of the fight joined up with the third hawk and the "top" hawk flew to a tree nearby. After a few minutes, the "top" hawk flew towards the other and then followed it when it flew off.

Note regarding the "Guest" comments below: Not interfering with nature is a proper guideline that's difficult to adhere to when one is so close to a violent battle between two such beautiful birds. Please see my photo of a Red-tailed Hawk with a damaged right eye: https://pbase.com/image/93694976 The memory of this hawk's damaged/missing eye is what compelled me to break up the fight.