The thing with shield walls is that a shield is a weapon, and a shield wall needs to be active and aggressive to hold it's ground. If someone walks up to the wall and just starts pulling on the shields and spraying pepper spray someone needs to be able and willing to smack them hard enough to lay them out, then walk the shield wall over them and crush them. It can't be static or stationery, or it can be pulled apart.
Concave shaped shields are designed for use in heavy shieldwall type fighting. Think the greek bowl and the roman trunk shaped ones. The flat shields used in northern europe were made for closing in and were ment to be disposable and not really ment for shieldwall smashing like in the movies.
The thing with shield walls is that a shield is a weapon, and a shield wall needs to be active and aggressive to hold it's ground. If someone walks up to the wall and just starts pulling on the shields and spraying pepper spray someone needs to be able and willing to smack them hard enough to lay them out, then walk the shield wall over them and crush them. It can't be static or stationery, or it can be pulled apart.
Concave shaped shields are designed for use in heavy shieldwall type fighting. Think the greek bowl and the roman trunk shaped ones. The flat shields used in northern europe were made for closing in and were ment to be disposable and not really ment for shieldwall smashing like in the movies.