The Tornaco Ministry was in office in Luxembourg from 26 September 1860 until 3 December 1867. It was reshuffled six times.
The government of Victor de Tornaco saw several important developments in international politics, such as the dissolution of the German Confederation in 1866 after the Austro-Prussian war, and an attempt by Napoleon III to purchase Luxembourg off William III of the Netherlands, which was prevented by Otto von Bismarck. A solution to this crisis was found in London, and made official in the Second Treaty of London: the Prussian garrison had to withdraw, the fortress of Luxembourg was demolished and Luxembourg was declared neutral and independent.
In the same period, railway lines were laid down from Wasserbillig to Trier and from Ettelbrück to Gouvy, which was a boost to the steel industry in Luxembourg.
The election of 1857 was a boost to the opponents of the Simons government within the Assembly of Estates. It became more and more difficult for the ministers of the coup d'État of 1856 to continue governing, in the face of majority of the opposition. Charles-Mathias Simons tendered his resignation on 26 September 1860. The opposition Deputy and old ally of Norbert Metz, Baron Victor de Tornaco, was charged with forming a new government.
In foreign affairs, the Tornaco government had to face a profound crisis from 1866 to 1867, which threatened Luxembourg's independence. The German Confederation was dissolved after the Austro-Prussian war of 1866. Although Luxembourg did not join the new North German Confederation formed by Prussia, the latter continued to maintain a garrison in the fortress of Luxembourg. At the same time, France now demanded a territorial compensation for having stayed neutral during the conflict. Napoleon III proposed to the King-Grand Duke to purchase the Grand Duchy for 5 million francs. William III accepted, but the Prussian chancellor Otto von Bismarck was staunchly opposed. To resolve this crisis in which Napoleon III risked losing face, the great powers came together in London. They finally agreed that Prussia would withdraw its garrison, the fortress would be demolished, and the Grand Duchy would become neutral in perpetuity. France would renounce its territorial claims. The Tornaco government had observed a strict neutrality during the Austro-Prussian war. During the negotiations in London, the Luxembourgish delegates had adopted a wait-and-see attitude, almost one of resignation. The government was mainly concerned with the costs of the impending demolition of the fortifications, whereas the city council of Luxembourg was anxious to guarantee the revenues of the city's businesses and shops, which would suffer from the departure of the garrison.