sentences:  Remembering comments by First Sea Lord Admiral Sir Arthur Wilson, who complained that submarines were "underhanded, unfair, and damned un-English" and that personnel should be hanged as pirates, Horton few the flag when the "E9" returned to port following the sinking of the "Hela".They flew additional flags after each successful patrol, but when there was no room for more flags, they began adding symbols, each indicating a certain achievement, to a single large flag.This practice was imitated by other British submarines during World War I, and it was renewed again during World War II.