Flank

Cromwell sent only part of his cavalry to pursue Langdale’s retreating men and prevent them from returning. He retained control of most of his force and ordered it to wheel left towards the Royalist infantry. His horsemen could now strike that infantry in its flank and rear while it was still fighting Parliament’s foot soldiers.

The central problem was the army’s flanks: its left and right sides. If Persian cavalry rode around them, it could attack the Macedonians from the side or rear, where their formation was more vulnerable.