Frederick William, the Great Elector, learned from the Thirty Years' War that the security of his state must rely mainly upon the support of:

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Frederick William, the Great Elector, concluded from the experiences of the Thirty Years' War that the security and independence of his state, Brandenburg-Prussia, could best be maintained through a strong, standing army. This realization led him to focus on military reforms and building a capable military force, rather than relying on external powers for protection.

Frederick William, the Great Elector, Learned from the Thirty Years