Wallenstein Supreme Commander
Apr 7 Albrecht von Wallenstein appointed German supreme commander by Holy Roman Emperor Ferdinand II
Stadtholder Frederick Henry
Apr 23 Prince Frederick Henry appointed Stadtholder of Holland, Zeeland, Utrecht, Guelders, and Overijssel
- May 1 Portuguese and Spanish expedition recaptures Salvador (Bahia) from the forces of the Dutch West India Company
- May 11 Peasants besiege Frankenburg estate in Upper Austria
- May 15 16 rebellious farmers hanged in Vocklamarkt, Upper-Austria
- Jun 2 Prince Frederick Henry sworn in as viceroy of Holland/Zealand
- Jun 5 Spanish troops under Spinola conquer Breda
- Aug 6 Earl Earnest Casimir appointed as viceroy of Groningen
- Aug 16 Earnest Casimir of Nassau-Dietz appointed viceroy of Drenthe
- Sep 13 16 Rabbis (including Isiah Horowitz) are imprisoned in Jerusalem
- Sep 24 Dutch attack San Juan, Puerto Rico
Cádiz Expedition
Oct 8 English Admiral George Villiers' fleet sails from Plymouth to Cadiz, Spain
- Dec 9 Netherlands & England sign military treaty
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