Why did Ferdinand II appoint Albrecht von Wallenstein to command imperial forces in 1625?

In 1625, Emperor Ferdinand II appointed Albrecht von Wallenstein to command imperial forces primarily to reduce his political and military dependence on the Catholic League, led by Duke Maximilian I of Bavaria.

During the early stages of the Thirty Years’ War, Ferdinand’s military successes were largely achieved through the League’s armies rather than his own. This reliance gave Maximilian significant political leverage, which the emperor sought to counter. When the Danish War (1625–1629) broke out, Wallenstein proposed raising an independent imperial army of 24,000 men. Crucially, Wallenstein offered to finance this force himself—using his own resources and funds advanced by his financial agent, Hans de Witte—without placing a direct burden on the imperial treasury.

Ferdinand accepted this proposal, appointing Wallenstein as capo of all imperial forces on April 7, 1625. This move allowed the emperor to field a powerful military force that answered directly to him, thereby strengthening his own authority and autonomy within the Holy Roman Empire.