If I remember correctly, the Shieldwall formation causes your men to really close up the formation to make it very tight and compact. This also serves the same purpose as the guard command and they will hold their ground and have a better defense while doing it. They can move as a Shieldwall but slower than if in standard formation. It is like the Phalanx in that respect. Schilltron is similar but is an all-around defensive hedgehog type formation. Excellent to counter swift cavalry forces. This formation can also move but takes a few seconds to reform after halting, so they are vulnerable if they get hit by a cavalry charge right after they stop moving.
edit: Just checked the demo again and maybe the units do move as fast while in Shieldwall formation. They loosen the formation up while running but return to it when they stop. Again, this can make them vulnerable if they are hit before they can get reformed I would figure. I like the new formations.
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