Instance creation problem

[szymek.k3]

army is declared in the class

public var army:Array;

When I try to declare the newEnemy, the code doesn't work, here is what I done:

			for (var i:int = army.length-1; i>=0; i--)
			{	
				var newEnemy=new Enemy(x,y);
			  	var nme:Enemy = army[i];
 			 	if (newEnemy.hitTestObject(nme))
			 	{
 			  		 nme.y+=120;
				}
			}

P.S. I don't know how to declare newEnemy in such a way so it doesn't interfere with other code and i also get a warning:

Warning: 3596: Duplicate variable definition.