Aside from being a brilliant film, at different times humorous and moving, LA MARSEILLAISE is hands down the most accurate film out there when it comes to the French Revolution.
Some have noted it's "one-sided" aspect, but allow me to make an observation: when royalists want to make a one-sided film on the French Revolution, they... make stuff up! Usually utter bilge, such as THE SCARLET PIMPERNEL or A TALE OF TWO CITIES, films (and original books) whose only basis in historical fact can be summed up as, yes, there was a revolution in France in 1789, and yes indeed, Britain and France are on opposite sides of the Channel. Those who support the republic, on the other hand, have typically had the scruples to actually *do their research* before setting out to mold the public's impressions of so momentous an historical event. Such is the case with LA MARSEILLAISE, where a large percentage of the dialog is taken from historical records. (In fact, the only real complaint one could have as far as historical accuracy goes is costuming, but I've yet to see any film from that era--1938, in this case--that had accurate costumes.)
All this is not to suggest that LA MARSEILLAISE is dull. Far from it! As mentioned before, LA MARSEILLAISE is witty and often poignant. In showing the Revolution from the point of view of ordinary citizens instead of aristocrats or well-known revolutionary leaders, the film shows to what point common citizens were dedicated to the ideals of the Revolution, as well as showing a human side to the "mob" so frequently portrayed.