 Other signatories included Britain, France, the Dutch Republic, Spain, Russia, Denmark and Savoy-Sardinia but subsequent events underlined Eugene of Savoy's comment that the best guarantee was a powerful army and full Treasury.His nieces were married to the rulers of Saxony and Bavaria, both of whom ultimately refused to be bound by the decision of the Imperial Diet and despite publicly agreeing to the Pragmatic Sanction in 1735, France signed a secret treaty with Bavaria in 1738 promising to back the 'just claims' of Charles Albert of Bavaria.In the first part of his reign, the empire continued to expand; success in the Austro-Turkish War (1716–1718), adding Banat to Hungary, and establishing direct Austrian rule over Serbia and Oltenia (Lesser Wallachia).