 Complete the following phrase:  After securing an additional five-day truce on the 13th, Bonaparte proposed the start of negotiations on 16 April, even though he had no authority to do so. Aware that the French were on the brink of launching an offensive on the Rhine, the Austrians signed the Preliminaries of Leoben on the 18th. Most of the terms of this agreement were confirmed by the Treaty of Campo Formio on 17 October 1797. The armistice was followed by pointless fighting on the Rhine. On the 18th, a French army under General of Division Lazare Hoche defeated Feldmarschall-Leutt Franz von Wernecks forces at the 