Ok so this is the same map but with a stone circle added. (red square)
Here is the idea 2 vs 1:
Host to hold Stone Circle for 60 KotH points
At the end of piece time Defender in castle takes control of stone circle ASAP (red square). the attackers have 1 hour to get through the castle defenses to keep the defender from winning. If they do get through attackers can hold circle for an hour or kill his king.
Just had a batle against 1 guy and he would have reached the stone circle with in 1 1/2 hours. so 2 attacking should be right on schedule with a 1 hour game.