Then I do suggest that you take an in-depth look at Senarmont, both at Friedland and Ocana. Further, the use of French artillery at Raab, Ligny, Lutzen, Wagram, and Waterloo might be useful.

The infantry wasn't used to 'protect' artillery which could if employed properly could protect itself, but used to support the artillery if the artillery was being used as a maneuver unit as it was in the actions cited above. Before Senarmont's innovative tactics, artillery was employed as a supporting arm in that it supported the infantry and cavalry. From Friedland on if the opportunity presented itself such as in the actions cited above, the artillery was the supported arm and a major maneuver unit.

Sincerely,
K