Run a version of the glory hunt event where gods of war match each team or 5ta against one (supposedly equal) peer, so they are forced to attack each other, no hard feelings for targeting
Maybe make it a sequence of a few different matches, to even out the inevitable bad luck in hard to measure disadvantages.
Maybe prevent the actual conquering of castles and revive all troops in the end, or maybe not, or maybe consider other prizes/trophies.
Maybe do it on a separate minimap with equal starting conditions. Or maybe not.