After realising that rather than fight all the wasp like things that keep coming at you in the mountain trail level, but simply run past them, I finally finished the level. The action is full on all the way through and the loss of health is certainly a problem.
I am now at a level that just goes on and on, the Ichinotani Battlefield. You no sooner defeat one wave of soldiers to be confronted with more and more. There is health around but not nearly enough to sustain the warriors. There must be an easier way to get through but I just haven’t found it yet.
If anyone has any suggestions I would certainly appreciate them. I haven’t been able to find a satisfactory answer on the forums.