A military formation common in ancient and  medieval warfare where soldiers would stand shoulder-to-shoulder and hold their shields so that they would abut or overlap.  While no longer used in military tactics, today it is still utilized by police forces, especially in riot suppression.

h4. See also

* [[phalanx]]

h4. External links

"Wikipedia: Shield wall":[https://en.wikipedia.org/wiki/Shield_wall]
shield wall