Misc: What Shakespearean play features the line 'a plague on both your houses?

Questions

In 1792 France declares war on Austria, Prussia & ---------- ?

In 1809 Napolean I defeats ---------- at Battle of Abensberg, Bavaria ?

In 1841 1st detective story (Poe's "Murders in the ---------- ") published ?

In 1879 The first "mobile home" (horse drawn) is used for a journey between London and ---------- . ?

In 1902 Marie and ---------- Curie isolated the radioactive element radium. ?