There is a technique called 'influence maps' where you projects where the enemies are and where you and friendlies are to try to figure out what to do in a situation. Getting more of your guys to fire at your targets and not have them fire at you (try to outnumber them etc) or retreat from them or find a path where you can avoid them enemy etc... Locations of power ups to move towards (ofeten combinations of all of these as in a fluid situation felexibility is often more useful than optimal actions.
More detailed fire-fight analysis mapping of this type can use arcs of fire and blocking terrain to be very specific about where you can have cover and /or shooting at a particular target. More complex calculations can be planning future moves where Sequences of possible movements and potential reachable locations for the enemies are investigated to try to give you the best future actions to carry out.
Depending on how your game mechanics work (simpler grid cell based games, vs full 3D ex- (where a unit might scootch/lean to the side a ittle quickly and trake a shot and then return to the cover)
Another technique called 'planners' help you organize an analysis of a situation, explore options and prioritize actions (possibly with several goals in mind simultaneously(