This shows when Napoleon visits on March 11, 1799 for his sick soldiers which were located at the Plague that Strikened in Jaffa, It was an attempt to put down shady rumors after Napoleon ordered that 50 incurable dying plague victims in Jaffa to be poisoned during his retreat from his Syrian expedition.
This is what basically the painting was all about.
An orchestra is defined as a large instrumental ensemble typical of classical music. An orchestra features bass, brass, strings, woodwinds, and percussions. In the list given above, the section that is not one of the four groups in the orchestral palette is the voices. The answer would be "voices".
