Your objective with a Rearguard is to slow your opponent's advance. To do this, you need to study the terrain and locate the choke points. If you can force your pursuers to abandon the road and travel through more costly terrain, such as fields, you can buy yourself some time. You should also employ feints and stunts to force him to deploy more than he would like. Cavalry is good for this as they are a definite threat to infantry that is not in square. The general principles of maneuver apply here as well. Keep your enemy’s movements under constant observation while minimizing his vision of your units. If he is not sure exactly what is in front of him, he will be more cautious (i.e. slower) in his advance. If he becomes too bold, set up a sharp, brief counterattack to harm him, but make certain that you can readily extract these forces. This will make him more cautious the next time he advances.
Cat and Mouse, Fred. He is the cat that will certainly kill you if he can sink his claws into you. You are the mouse that bobs, weaves and nips at his exposed tail, running back into a safe hole before emerging somewhere else to take another little nip.
Of course, I have always found that a continuous line of Claymores arranged along both sides of the main pike wreaks terrible devastation on an enemy march column as well, but that could just be me.
