Using arrays for more than 1 MC

i’m trying to use an array to attach up to 4 movie clips, using the same script. My code I’m using to attach looks like:

if(en<=4){
            EA[t] = attachMovie("enemy", "enemy"+t, depth++);
            EA[t]._x = random(300);
            EA[t]._y = random(300);
            en+=1
                         t+=1
        }

This part works fine, but what doesn’t work is the script I try to add to the movieclips. If i add EA[t]._x += 10, then only the lastly created enemy moves. How do i make it so that all of the enemies move?