I'd say it was General Jean-Baptiste Éblé as he was the commander of the pontonniers who built the bridges for the troops to cross over the river.
The first troops to actually cross the infantry bridge were the men of Legrand's Division, who also wheeled two cannon across with them. These were followed by the rest of Oudinot's Corps, the Young Guard and Ney's Corps, the later of which totalled a mere six hundred sturdy men. Victor's Corps, Davout's Corps and the Old Guard remained in positions east of the crossing to prevent an unopposed attack by the Russians.
John
PS I love these Quiz questions, gives me something to do at work for lunchtime