In volume 2 of his memoires - Pelleport writes this about 3e corps at the start of the battle at Borodino:

Le 3e corps se forma en colonne par bataillons déployés et attendit dans cet ordre le signal de l'attage
p. 25 (google page 39)

Question - what do you make of this formation

a bataillon déployés - a deloyed battalion - is - in my view a battalion in line.

Does that mean that the whole 3rd corps was stacked one battalion in line behind each other???