Short answers, pulled from the story.
Henri Félix Emmanuel Philippoteaux entered the studio of Léon Cogniet in Paris during the early 1830s. He studied under this master while preparing for his public debut at the Paris Salon of 1833.
His first exhibited work that year was titled The Iceberg, Episode of the Wars of America. This piece marked his official entry into the professional art world and depicted a maritime disaster involving American ships and icebergs.
Philippoteaux received the Légion d'honneur in 1846 for his contributions to military art. The award recognized his dedication to preserving historical events through paint.
This format involved painting on the inside of a cylindrical platform where viewers stood in the center to see a 360-degree view. He enhanced the effect by adding three-dimensional elements such as dioramas and actual battlefield objects placed in front of the painted surface.
Henri worked closely with his son Paul Philippoteaux on several major projects including The Defence of the Fort d'Issy in 1871. Their joint effort combined Henri's experience with Paul's fresh perspective.