Supply Example?

[Bandito]

It's my understanding that it's always best to put HQ (and maybe even supply?) units on or adjacent to other units. In the over five years I've been playing the game, I only recently learned the value of this thanks to playing in PBEM.

I'm still getting used to it, though. I like to put HQ and supply units just behind the front lines to keep them out of harm's way. Does anyone like to use them in an offense? Does it make a difference to put an HQ or supply unit on a road or rail hex?

Was hoping someone could post some illustrations of supply in action, with the Supply Value views turned on. That would be very helpful!