 Complete the following phrase:  The three ships spent the 1870s laid up in Pola; budgetary issues prevented the ironclad fleet from being active. In 1881, Prinz Eugen was mobilized for the first time to take part in an international naval demonstration against the Ottoman Empire to force it to transfer the city of Ulcinj to Montenegro in accordance with the terms of the 1878 Congress of Berlin. In 1888, all three ships travelled to Barcelona, Spain, with several other major warships to take part in the opening ceremonies for the 