sentences:  She supported offensive minelaying operations and patrolled the central Baltic for Russian forces, but never encountered hostile forces.She provided gunfire support during the attack on Libau in May 1915 and shelled Russian positions during the Battle of the Gulf of Riga in August.In the face of severe crew shortages in late 1915, "Prinz Heinrich" had her crew reduced and was ultimately decommissioned and disarmed in March 1916.