The misdeeds of Napoleon’s occupation army in Spain were not photographed. Photography had not yet been invented. The valiant fighters against the occupation had to rely on Francisco Goya for the immortal painting of the resistance.
The partisans and underground fighters against the German occupation of their countries in World War II had no time to take pictures. Even the heroic uprising of the Jewish Ghetto in Warsaw was not filmed by the participants. The Germans themselves filmed their atrocities, and, being Germans, they catalogued and filed them in an orderly way.