Originally Posted by
NeoSpartan
...The horizontal grip was the norm in most shields since they were lighter. Romans, Iberians, Celtics, Germanics, Thracians, etc made shields with a horizontal grip.
...The "shield wall" formation the Romans (Celts/Iberians/Germanics/etc) used was A TYPE of formation, not the the ONLY way of fighting. This shield wall thing was best used when dealing with human wave assaults, and cavalry charges. It was mainly a stand off formation with its strength being in the ability to wear down the enemy line while taking few casualties, and then attacking.
....Soldiers usually had a few feet space between each other, sometimes more, sometimes less depending on who they were fighting, the terrain, and what they were trying to accomplish.