He took part in the Battle of Freiburg (1644), the Battle of Alerheim (1645) and was active at Philippsburg, serving the Prince de Condé, the Vicomte de Turenne and the Duke of Saxe-Weimar. In 1646, he went to Bergamo and Venice and served under General Leonardo Foscolo in Dalmatia. In 1648, the Venetian army occupied Dugopolje and moved up to the Ragusa. As the Turks had occupied the island of Crete the Venetian army went as far as Risan, Bar and Budva in order to occupy Albania. When Foscolo was appointed in Candia in 1651, Ruse decided to leave the army because of problems with his legs, and on his way back, he paid great attention to defence systems and facilities.