During World War II, from 1940 into 1943, the German U-boats took a tragic toll on Allied convoy ships in the Atlantic. Our control of the maritime trade routes was essential for a successful war effort in Europe.
By mid-1943, U.S. Navy destroyer escorts turned the tables on the U-boats by using anti-submarine tactics.
Fast forward to 2019.
Oil tankers are being pirated by Iran when passing between the Persian Gulf and the Arabian Sea in the Strait of Hormuz. A combined effort of U.S. and British naval resources could provide protection for the tankers, were they in a convoy configuration, much the same as we thwarted the U-boats in 1943.