 Complete the following phrase:  Kronprinz participated in a fleet operation into the North Sea which ended without combat from 29 until 31 May 1915. In August, Constanz Feldt replaced Dalwigk zu Lichtenfels as the ships captain. The ship supported a minelaying operation on 1112 September off Texel. The fleet conducted another sweep into the North Sea on 2324 October. Several uneventful sorties followed on 57 March 1916, 31 March and 23 April. Kronprinz supported 