When her commander fell ill in October, he was replaced by Georg Ritter von Trapp. U-14 was damaged by a depth charge attack in February 1916, and underwent an extensive modernization through November. Resuming duty under von Trapp, U-14 sank her first ship in April 1917, but had her most successful patrol in August, when she sank five ships—including Milazzo, reportedly the largest cargo ship in the world—in a six-day span.