ten Royal Navy flag officers to die during the First World War
... that of the ten Royal Navy flag officers to die during the First World War, three were killed in action?
... that of the <b id="mwBAk"><a href="./List_of_Royal_Navy_flag_officers_who_died_during_the_First_World_War" id="mwBAo" rel="mw:WikiLink" title="List of Royal Navy flag officers who died during the First World War">ten Royal Navy flag officers to die during the First World War</a></b>, three were killed in action?