The 1848 uprisings in Germany put Engels in mind of the last great peasant rebellions of the 1500s. As he would later write:

“The parallel between the German Revolution of 1525 and that of 1848-49 was too obvious to be altogether ignored at that time.”

Engels demonstrates the failure of both these revolutions was largely attributable to the bourgeois/burgerdom (and thus underscoring the modern need for an alliance between the working proletariat and the working peasantry).

The Peasant War in Germany was the first history book to assert that the real motivating force behind the Reformation and 16th-century peasant war was socio-economic (class conflict) rather than “merely” religious.

ADDENDUM:

Engels' "The Peasant Question in France and Germany" was part of the current debate around agrarian issues. Engels wrote it as rebuttal to various French Socialists (like Vollmar) and the agrarian programme adopted in Marseilles...