Revolution of 1848: The Hungarian Revolutionary Army, under the leadership of Arthur Görgey, starts the victorious Spring Campaign, which leads to the liberation of much of Hungary from the Austrian forces. April 2 The German revolutions of 1848–49 end in failure, as King Frederick William IV of Prussia refuses to accept the offer of the Frankfurt National Assembly, to be crowned as German emperor. Hungarian Revolution of 1848 – Battle of Hatvan: The Hungarian revolutionary army, under the command of András Gáspár, defeats the Austrians, led by general Franz Schlik. April 4 – Hungarian Revolution of 1848 – Battle of Tápióbicske: Hungarian forces, under the generals György Klapka and János Damjanich, defeat the Austrian-Croatian army, led by Franz Schlik and Josip Jelačić. April 6 – Hungarian Revolution of 1848 – Battle of Isaszeg: The main Hungarian forces, led by Arthur Görgey, defeat the main imperial forces, led by Alfred I, Prince of Windisch-Grätz, forcing them to retreat westward. April 10 – Hungarian Revolution of 1848 – Battle of Vác: The Hungarians, led by János Damjanich, defeat the Austrians, led by Christian Götz, who dies after the battle due to his injuries. April 12 Hungarian Revolution of 1848: Because of his series of defeats suffered from the Hungarian army, Alfred I, Prince of Windisch-Grätz is released from the supreme command of the Austrian forces in Hungary, and replaced by Ludwig von Welden. Astronomer Annibale de Gasparis discovers the asteroid 10 Hygiea. April 14 – Hungarian Revolution of 1848: The Hungarian revolutionary parliament in Debrecen declares independence from the Habsburg Empire. April 19 – Hungarian Revolution of 1848 – Battle of Nagysalló: The Hungarian revolutionary army, led by György Klapka and János Damjanich, defeat the Austrian army, led by Lt. Gen. Ludwig von Wohlgemuth. April 21 Great Famine (Ireland): 96 inmates of the overcrowded Ballinrobe Union Workhouse died over the course of the preceding week from illness and other famine-related conditions, a record high. The Austrian government asks Russian help against the Hungarian Revolution. Tsar Nicholas I of Russia agrees to send troops against Hungary. April 22 – The first Kennedy arrives in America. April 25 – James Bruce, 8th Earl of Elgin, the Governor General of Canada, signs the Rebellion Losses Bill, outraging Montreal's English population and triggering the Montreal Riots. April 26 – Hungarian Revolution of 1848 – Battle of Komárom: Hungarian forces relieve the city and castle with the