Bill, thanks, yes, you are completely right, my error.
The correct and only way to form the attack column is this one:
Below, an - unfortunately quite small - drawing of a Prussian square. The space between the Züge was filled by the NCOs.
If you follow the link below and register (it doesn't cost anything), you will be able to see a detailed drawing of a Prussian Angriffs-Colonne.