Hollow square setup - How To Discuss

Hollow square setup,

Definition of Hollow square setup:

1. Infantry corps in the field with the field in the center.

2. Seating arrangement in which chairs (and tables) are arranged in a square (or rectangular) shape in front of an empty center.

How to use Hollow square setup in a sentence?

1. Residents stood five meters deep in a 20-meter-high hollow and saw a group of military engineers destroy weapons.