Counterchanged

... both sides re-engaging with exactly counterchanged fronts and positions. Again did the stern valor of the Roundheads prove irresistible : Goring was swept from the field, after a furious struggle,[…]

If the field is divided palewise, or and azure, and cross is borne counterchanged, that part of the cross which comes on the azure side will be or, and that on the or side will be azure.