The <a href="https://en.wikipedia.org/wiki/Congress_of_Arras" id="mwIg" rel="mw:WikiLink" title="Congress of Arras">Congress of Arras</a> causes <a href="https://en.wikipedia.org/wiki/Burgundian_State" id="mwIw" rel="mw:WikiLink" title="Burgundian State">Burgundy</a> to switch sides in the <a href="https://en.wikipedia.org/wiki/Hundred_Years'_War" id="mwJA" rel="mw:WikiLink" title="Hundred Years' War">Hundred Years' War</a>.