of Prince William. William I sent his two sons, Crown-Prince William and Prince Frederik to quell the riots. William was asked by the Burghers of Brussels to come to the town alone, with no troops, for a meeting; this he did, despite the risks. The affable and moderate Crown Prince William, who represented the monarchy in Brussels, was convinced by the Estates-General on 1 September that the administrative separation of north and south was the only viable solution to the crisis. His father rejected the terms of accommodation that Prince William proposed. King William I attempted to restore the established order by force, but the 8,000 Dutch troops under Prince Frederik were unable to retake Brussels in bloody street fighting (23–26 September). The army was withdrawn to the fortresses of Maastricht, Venlo, and Antwerp, and when the Northern commander of Antwerp bombarded the town, claiming a breach of a ceasefire, the whole of the Southern provinces was incensed. Any opportunity to quell the breach was lost on 26 September when a National Congress was summoned to draw up a Constitution and the Provisional Government was established under Charles Latour Rogier. The Provisional Government then issued a Declaration of Independence on 4 October 1830. The European powers and an independent Belgium On 20 December 1830 the London Conference of 1830 brought together five major European powers: Austria, the United Kingdom, France, Prussia and Russia. At first, the European powers were divided over the Belgian cry for independence. The Napoleonic Wars were still fresh in the memories of the major European powers, so once the French, under the recently installed July Monarchy, supported Belgian independence, the other European powers unsurprisingly supported the continued union of the Provinces of the Netherlands. Russia, Prussia, Austria, and the United Kingdom all supported the Netherlands, since they feared that the French would eventually annex an independent Belgium (particularly the British: see Flahaut partition plan for Belgium). However, in the end, none of the European powers sent troops to aid the Dutch government, partly because of rebellions within some of their own borders (the Russians were occupied with the November Uprising in Poland and Prussia was saddled with war debt). Britain would come to see the benefits of isolating France geographically with the new creation of a new Belgian buffer state between France, the Netherlands and Prussia. It was for that reason that Britain would eventually sponsor