<a href="https://en.wikipedia.org/wiki/World_War_II" id="mwjw" rel="mw:WikiLink" title="World War II">World War II</a>: The British <a href="https://en.wikipedia.org/wiki/Royal_Air_Force" id="mwkA" rel="mw:WikiLink" title="Royal Air Force">Royal Air Force</a> suffers its first fighter pilot casualty of the Second World War at the <a href="https://en.wikipedia.org/wiki/Battle_of_Barking_Creek" id="mwkQ" rel="mw:WikiLink" title="Battle of Barking Creek">Battle of Barking Creek</a> as a result of friendly fire.