Why did Albrecht von Wallenstein offer his resignation after the Battle of Dessau?

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Following the Battle of Dessau on April 25, 1626, Albrecht von Wallenstein tendered his resignation because he was reproached for allowing the Protestant commander Ernst von Mansfeld to escape during the engagement.1

Although the battle was the first success for Wallenstein's new imperial army, the criticism regarding Mansfeld's retreat led him to offer his resignation. He ultimately remained in command only after receiving an extension of his powers and permission to increase the size of his army to 70,000 men.1