This tip will only work if you have the long throw on your grenades. You need to go to Kingshead, and stand behind the fence looking toward the group of soldiers training in the middle of the grounds. Stand about 10 paces back from the fence. Now you can use any combinations of grenades, whatever works best for you. Just chuck a grenade into the group of guards, then when they come over, they will stop at the fence, then just hurl at them at your lesure. One word of warning, if you are standing to close you will still get hit, and if you stand too far away they will come through the fence. Carry on as many times as you want, you will pick up gold, and treasure as well as lvl up your grenades.