Hi,
My approach was to take out the two bowmen first, then the others. Use the knife on one and get Joy to use her special hold on the other. If she disables them, not only won't they attack in that round but they can't defend themselves.
So take out one with the knife, then send it Joy to hopefully disable the other. You will then have to cop some damage perhaps from the other two.
From then on, I sent Joy in first, and if she disabled someone I then attacked them using a kick from Largo. Generally got major damage. You should eventually get there.
Also, Joy can disable someone for one or two rounds (or none if unlucky). Don't disable someone already out of the picture.
All going well 4 or 5 rounds should see you home.
Hope that helps.
steve