The <a href="https://en.wikipedia.org/wiki/Battle_of_Oosterweel" id="mwFw" rel="mw:WikiLink" title="Battle of Oosterweel">Battle of Oosterweel</a>, traditionally regarded as the start of the <a href="https://en.wikipedia.org/wiki/Eighty_Years'_War" id="mwGA" rel="mw:WikiLink" title="Eighty Years' War">Eighty Years' War</a>.<sup about="#mwt17" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-2"}}' id="cite_ref-2" rel="dc:references" typeof="mw:Extension/ref"><a href="./March_13#cite_note-2" id="mwGQ" style="counter-reset: mw-Ref 2;"><span class="mw-reflink-text" id="mwGg">[2]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-2"><cite about="#mwt14" class="citation book cs1" id="CITEREFParker2014">Parker, Geoffrey (2014). <a class="external text" href="https://books.google.com/books?id=3O6uBAAAQBAJ&amp;q=%22Battle+of+Oosterweel%22+march+13&amp;pg=PA151" id="mwBu8" rel="mw:ExtLink nofollow"><i id="mwBvA">Imprudent King: A New Life of Philip II</i></a>. Yale University Press. p.<span id="mwBvE" typeof="mw:Entity"> </span>151. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBvI" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBvM" typeof="mw:Entity"> </span><a href="./Special:BookSources/978-0-300-21044-6" id="mwBvQ" rel="mw:WikiLink" title="Special:BookSources/978-0-300-21044-6"><bdi id="mwBvU">978-0-300-21044-6</bdi></a><span class="reference-accessdate" id="mwBvY">. Retrieved <span class="nowrap" id="mwBvc">16 February</span> 2020</span>.</cite><span about="#mwt14" class="Z3988" id="mwBvg" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Imprudent+King%3A+A+New+Life+of+Philip+II&amp;rft.pages=151&amp;rft.pub=Yale+University+Press&amp;rft.date=2014&amp;rft.isbn=978-0-300-21044-6&amp;rft.aulast=Parker&amp;rft.aufirst=Geoffrey&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D3O6uBAAAQBAJ%26q%3D%2522Battle%2Bof%2BOosterweel%2522%2Bmarch%2B13%26pg%3DPA151&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AMarch+13"></span></span>