Thought I had just sprung a neat trap.
A parliamentary infantry unit screened the highlighted cavalry - it (the infantry) was advanced obliquely to the right opening to threaten the flank of the royalist foot and open the gap for the cavalry unit to - I thought - flank the Royalist horse directly in its front.
This is immediately after the infantry was moved.
The flank of the Royalist horse is the only unit that the parliamentary cavalry could reach but it is not the priority target and the charge is not allowed.
I am sure there is a reason but having resorted to the manual I cannot work out why?
Any answers please
