Apr 1848Papal States, Sicily& Naples join warvs Austria
12 Apr 1848German states declarewar on Denmark overSchleswig-Holstein
13–27 Apr 1848Hecker uprisingin Baden
13 Apr 1848Sicily declaresindependence
19 Apr–9 May 1848Polish uprisingin E. Prussia
23 Apr–15 May 1848Insurrections inFrance after left-wingdefeat at polls