One large concrete pillbox in the building housed a 37mm gun.

Remo heard sounds from the other end of the giant concrete pillbox.

They were approaching the first roadblock, a concrete pillbox with three armed men before it.

Initially very crude, the fires were controlled from a nearby concrete pillbox.

There are still some remaining concrete pillboxes and brick built blockhouses.

Although it was broad daylight when the girls got there, the border guards couldn't see this section of the river from their concrete pillboxes.

To their north were another three machine-guns and a concrete pillbox.

Both sides patrol the line and have set small concrete pillboxes at intervals on opposing hills.

Scattered concrete pillboxes covered by low brush and debris can be found in the surrounding jungle.

And that center, as enormous as a concrete pillbox!