[unkated]

Some more:

• At night, 5 shots, spaced several seconds or even minutes apart, zing through your position. May be from the same direction or multiple directions. They may or may not hit anyone. Then there are no more. A search in the dark reveals … nothing. Search later in daylight reveals nothing either.
  
  
• You are caught in a barrage of 5-10 rounds of mortar or heavy artillery (105 -152mm howitzer) shells, all within 2 minutes. Then it stops. Veteran characters may be able to identify the weapon used. It can be from either side. (You are on some else's "shell here" map coordinates.)
  
  
• The next prominent piece of terrain a klick or so ahead on your march (town, cross roads, point where road tops a ridgeline) is shelled with a barrage of 5-10 rounds of mortar or heavy artillery (105 -152mm howitzer) shells, all within 2 minutes. Then it stops. Other than the terrain feature, you cannot see a target for the shelling.
  
  
• 500-600 m away (or further), out of sight, there is a loud explosion, a bright flare, and then a smoke plume. On investigation, some kind of truck exploded. There are pieces of metal, machinery, shredded tires, in a 10-20m circle around a small crater; if wooded, there are small fires in the brush. No clue as to whose truck it was, what type of truck it was (there are large pieces to identify), or what it was carrying. There had been no engine sound before the explosion.
  
  
• 5-600 meters away from your team’s encampment/emplacement, at twilight or later, another group arrives and begin to set up an encampment. They are of a size similar to yours, but seem to be unaware of your presence. You cannot tell whose troops they are. (If your team does nothing, in the morning, they will break camp and move on, oblivious to your presence).

Uncle Ted