During the Napoleonic wars in Europe, many heavy cavalry units still retain the use of armours, for example, French Carabiniers-à-Cheval below, How effective were these to protect the cavalryman ...
In Napoleonic wars era, a line contains mostly regular troops except for two kind of elite units, the heavy one, e.g. grenadiers, they normally are the bravest, strongest troops with the best stamina, ...
In movies/books set in the Napoleonic Wars, the British are normally deployed into lines and the French into columns. The columns are usually the advancing ones, charging into the line as the line ...