I call the formation gun shell formation

 

it is similar to traffic driving on a road. There should be one forward car that acts like the dummy and handles leadership

and getting shot first and so forth

 

it goes like this

 

x    <-- forward car/person   

xx

xxx

xx    

 

other variations exist from this formation but the basic is clear that there is one forward person.

 

                                       x

xxxxxxxxxxxxxx                       xxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxx                    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

 

 

 

 

            x

xx                     xx

xxx                xxx