An idea, because he said Right flank could be the shield.
Usually men fights with the right hand, while the left carryes the shield.
Troops located on the right flank then are more vulnerable to flanking charge, and missile fire.
If the unit is located as last one on that flank, it's always in danger of such actions, and probably the main opponent target.
To be able to defend itself, the army has only to rotate(bending the first line), placing the right flank a bit uphill and blocking the enemy movement occupying the higher ground.
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