In the Franco-Prussian War, France had already demonstrated the dangers of having army divisions that were too small, which meant that when forming larger military divisions for large-scale wars, each division often lacked coordination, thereby reducing the combat effectiveness of the entire army.
In the Franco-Prussian War, most of the French armies were at the regiment level, and when forming larger-scale divisions, the combat effectiveness of each division was not as excellent as imagined, which was one of the reasons that led to the failure of the French.
Forming a division-scale military formation is a necessity for the development of the current era, and Spain must follow suit.
The good news is that Prime Minister Prim and Duke Serrano have already drafted a preliminary plan for the reform of the Spanish Military's structure, and a new list of Spanish military formations has been born under their efforts.
