The tumultuous three years of liberal rule that followed (1820–23) were marked by various absolutist conspiracies. The liberal government, which reminded European statesmen entirely too much of the governments of the French Revolution, was viewed with hostility by the Congress of Verona in 1822, and France was authorized to intervene. France crushed the liberal government with massive force in the so-called "Hundred Thousand Sons of Saint Louis" expedition, and Ferdinand was restored as absolute monarch in 1823. In Spain proper, this marked the end of the second Spanish bourgeois revolution.