How did Gustav II Adolf improve military mobility in the 17th century?

In the early 17th century, Gustav II Adolf of Sweden significantly enhanced military mobility, restoring a level of maneuverability not seen in European warfare since the Roman era.1

His improvements to military logistics and mobility included:

• Artillery Reform: He reduced the size of his artillery train and the weight of individual guns, which allowed his field artillery to become notably more mobile and effective on the battlefield.21
• Strategic Movement: To sustain large armies—which could reach 100,000 soldiers—he prioritized keeping forces in motion to avoid starvation. He utilized rivers for the economies of water transportation and strategically operated in fertile, food-producing regions to support his troops without relying on fixed bases.1
• Operational Efficiency: By streamlining his forces and logistic organization, he was able to maintain high mobility despite the increasing size of armies during the Thirty Years’ War.1

These efforts allowed the Swedish army to maintain a high operational tempo, enabling rapid campaigns across Germany.21