In the opening engagements of the war, Archduke John defeated the Franco-Italian army and drove it back to the Adige River at Verona. Forced to detach substantial forces to watch Venice and other enemy-held fortresses, John found himself facing a strongly reinforced Franco-Italian army near Verona. So embarrassed by his setbacks that he tried to minimize them in communications to his step-father Emperor Napoleon, Eugène determined to use his superior forces to drive the Austrian invaders from the Kingdom of Italy.