Administrative and economic centralization went hand in hand. The state of siege forced France into autarky; to save the Republic the government mobilized all the nation's productive forces and reluctantly accepted the need for a controlled economy, which it introduced extemporaneously, as the emergency required. It was necessary to develop war production, revive foreign trade, and find new resources in France itself; and time was short. Circumstances gradually compelled it to assume the economic government of the country. Along with organization of the army, this was the most original feature of its work.