<a href="https://en.wikipedia.org/wiki/Thirteen_Years'_War_(1454–1466)" id="mwIQ" rel="mw:WikiLink" title="Thirteen Years' War (1454–1466)">Thirteen Years' War</a>: the beginning of the <a href="https://en.wikipedia.org/wiki/Battle_for_Kneiphof" id="mwIg" rel="mw:WikiLink" title="Battle for Kneiphof">Battle for Kneiphof</a>.<sup about="#mwt25" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-3"}}' id="cite_ref-3" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_13#cite_note-3" id="mwIw" style="counter-reset: mw-Ref 3;"><span class="mw-reflink-text" id="mwJA">[3]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-3"><cite about="#mwt22" class="citation book cs1" id="CITEREFRogalski1846">Rogalski, Leon (1846). <i id="mwBls">Dzieje Krzyżaków oraz ich stosunki z Polską, Litwą i Prusami</i>. Vol.<span id="mwBlw" typeof="mw:Entity"> </span>II. Warsaw: S. Orgelbrand.</cite><span about="#mwt22" class="Z3988" id="mwBl0" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Dzieje+Krzy%C5%BCak%C3%B3w+oraz+ich+stosunki+z+Polsk%C4%85%2C+Litw%C4%85+i+Prusami&amp;rft.place=Warsaw&amp;rft.pub=S.+Orgelbrand&amp;rft.date=1846&amp;rft.aulast=Rogalski&amp;rft.aufirst=Leon&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+13"></span></span>