
I roll a 7(+4 FP,+2 Roll Bonus =13) to hit the enemy with just enough to eliminate it (12 Defense Rating, +1 Light Woods =13). The Soviet Rifle Squad is removed from play.
I have one unit that has yet to be activated, the Rifle Squad in the Woods. This unit is out of the LoS of all enemy units so it's eligible to HIDE. It cost 7 AP's to Hide a unit. To Hide a unit you press the HIDE button on the bottom of the toolbar. This button, like all the others in this toolbar, are only highlighted if the action is allowed.
For example, the LOAD UNIT button will never be highlighted for this scenario because there are no transports available.
I click the HIDE button and my unit is now Hidden and not an eligible target for the enemy. An icon with a tree above the Hidden unit shows that it is in fact Hidden and another icon will appear in its Unit Info Panel. Hidden units are automatically revealed if they take any action other than Hidden Movement. Units can perform Hidden Movement by paying +3 AP's to enter a hex that provides cover (light woods, woods, buildings etc) and +5 AP's to move Hidden into Clear terrain.

I am out of moves so I will pass repeatedly until the enemy does the same and the turn ends. I could pass my whole turn by pressing the PASS ENTIRE TURN button in the bottom toolbar(looks like a stop sign with an X in it), but I prefer to see how the enemy moves at my own pace.