War games are designed to exercise warfighting staffs. Some are designed to help establish key and decisive points.
A long time ago in a very different Army I was the intelligence officer in a Cavalry Squadron. I suggested that the Squadron exercise our role in the general defense plan through the use of map boards and "stickers". We set up a timeline for battle. We made a variety of assumptions about starting conditions. Then each platoon leader fought his platoon against me, the Red commander. We ran the drills over and over. Platoon leaders revised their tactics based on the drills.
We discovered no matter the starting assumptions the battles were lost on the ground at the same terrain features. We made better plans for killing the reconnaissance forces early as they crossed into our defensive area. We changed how we used the engineers to help construct barriers. We changed our decisions on where to place prepositions ammunition and fuel.
Everyone was better off.