Britain, seeking to maintain the security of the Ottoman Empire, sent a fleet to the Dardanelles, where it was joined by another fleet sent by France. Yet the European powers hoped for a diplomatic compromise. The representatives of the four neutral Great Powers—Britain, France, Austria and Prussia—met in Vienna, where they drafted a note which they hoped would be acceptable to both the Russians and the Ottomans. The note was approved by Nicolas but rejected by Sultan Abd-ul-Mejid I, who felt that the document's poor phrasing left it open to many interpretations. Britain, France and Austria were united in proposing amendments to mollify the Sultan, but their suggestions were ignored in the Court of Saint Petersburg. Britain and France set aside the idea of continuing negotiations, but Austria and Prussia held hope for diplomacy despite the rejection of the proposed amendments. The Sultan proceeded to war, his armies attacking the Russian army near the Danube. Nicholas responded by despatching warships, which destroyed the entire Ottoman fleet at Sinop on 30 November 1853, allowing Russia to land and supply its forces on the Ottoman shores fairly easily. The destruction of the Ottoman fleet and the threat of Russian expansion alarmed both Britain and France, who stepped forth in defence of the Ottoman Empire. In 1854, after Russia ignored an Anglo-French ultimatum to withdraw from the Danubian Principalities, Britain and France declared war.