The siege of Rheinfelden of 1633 or the Spanish recapture of Rheinfelden (Spanish: La Expugnación de Rheinfelden) took place in late October 1633, during the Thirty Years' War.^[1][2]

Siege of Rheinfelden (1633)
Part of the Thirty Years' War
The Capture of Rheinfelden by Vincenzo Carducci.
Date 17 October 1633 Location Rheinfelden, Further Austria (present-day Switzerland) 47°33′N 7°48′E / 47.550°N 7.800°E / 47.550; 7.800 Result Spanish victory
Belligerents
Spain	Sweden
Commanders and leaders
Duke of Feria	Unknown
Strength
20,000 troops[1][2]	350 troops[3]
Casualties and losses
Unknown	All killed[3]
Rheinfelden class=notpageimage| Location within Switzerland Show map of Switzerland Rheinfelden Rheinfelden (Germany) Show map of Germany

The Spanish Army of Alsace (20,000 troops)^[1] led by the Duke of Feria, Governor of the Duchy of Milan, recaptured the Habsburgian city of Rheinfelden after relieving Konstanz, Breisach and Bregenz. His plan, designed by the favourite and chief minister of Philip IV of Spain, Don Gaspar de Guzmán, Count-Duke of Olivares, was to release the Spanish road along the Rhine of the harassment by Swedish and Protestant-German troops (Heilbronn League), defend the Franche-Comté, safeguard the Tyrol, support the troops of the Holy Roman Empire, and open a strategic corridor for the Spanish troops from the Spanish Lombardy to the Spanish Netherlands.^[1][2]