He died in the shield wall next to his men.

I have never seen a poet in a shield wall.

And in the shield wall you stay close behind me.

The shield wall serves to protect the side from which the main attack is expected.

They seemed huge, larger than life, looming over the shield wall.

There will be shield walls to channel them if necessary.

The shields would be held in such a way that they presented a shield wall to all sides.

Below the shield wall is a moat cut out of the rock.

"If we attack, we'll break on their shield wall like waves against a cliff."

Either they stood in front of the shield wall or the wall opened to let them through.