when you face above 5 enemy
the system sometimes become very slow,
you can do nothing.
in enemy's turn,the system might be recovery,
if not,load game....
You can also update your video card's drivers, this might resolve the problem.
"When I am working on a problem I never think about beauty. I only think about how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." Buckminster Fuller
I hope updating your drivers will fix the problem. If either this solve your problems go check Ubi Soft's Support Site too.
"When I am working on a problem I never think about beauty. I only think about how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." Buckminster Fuller