Pop-Up Attacks

A “pop-up attack” is a special Attack maneuver in which you emerge
from cover, move no more than one hex, make a ranged attack, and
return to cover – all in the space of one turn! Examples include ducking
around a corner or a tree, or out of a trench. This is possible with any
thrown weapon, firearm, or crossbow, but not with a bow or a sling.
You cannot aim a pop-up attack. In fact, there is an extra -2 to hit
because you couldn’t see your target at the beginning of your turn.
Note that when you emerge from cover to attack, anyone targeting
your hex with opportunity fire can attack you. If so, your only legal
defense is a dodge.