 Complete the following phrase:  Two fruitless fleet advances followed on 1718 and 2123 April 1915. A third took place on 1718 May, and a fourth occurred on 2324 October. On 2425 April 1916, Pommern and her sisters joined the dreadnoughts of the High Seas Fleet to support the battlecruisers, which were again tasked with conducting a raid of the English coast. While en route to the target, a mine damaged the battlecruiser . She was detached to return home, and the rest of the ships continued with the mission. Due to poor visibility, the battlecruisers conducted a brief 