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When did Austro-Prussian forces invade Schleswig?
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Austro-Prussian forces invaded Schleswig on February 1, 1864.1
This military action followed Denmark's refusal to rescind its November 1863 constitution, a demand issued by Austria and Prussia on January 16, 1864. By ignoring federal troops in Holstein, the Austro-Prussian army moved to secure a joint settlement of the Schleswig-Holstein question, marking a departure from the broader policy of the German Confederation.1