protected boolean containsTank(int x, int y){
		
			for(Tank t: _enemyTanks){
				if(t.getX() == x && t.getY() == y)
					return true;
			}
			for(Tank t: _playerTanks){
				if(t.getX() == x && t.getY() == y)
					return true;
			}		
		return false;
	}