At the age of six, he became a drum major in the "Régiment Royal-Bonbons",[citation needed] a children's branch of the French Guards which was intended to provide "manly, patriotic training".
Two years later, his father made the acquaintance of Angélique Briceau (fl.1780-1800), a watercolorist who gave lessons to both of them.
Granger worked as an engraver for seven years but eventually felt constrained by the limits of that medium and entered the studios of Jean-Baptiste Regnault to study oil painting.
[1] In 1800, he was awarded the Prix de Rome for his painting of Antiochus, sending his son to Scipio.
[2] While in Rome, he worked for Lucien Bonaparte, making sketches and paintings of the Prince's antiquities collection.