<a href="https://en.wikipedia.org/wiki/Mongol_conquest_of_the_Jin_dynasty" id="mwLA" rel="mw:WikiLink" title="Mongol conquest of the Jin dynasty">Mongol–Jin War</a>: The <a href="https://en.wikipedia.org/wiki/Mongol_Empire" id="mwLQ" rel="mw:WikiLink" title="Mongol Empire">Mongols</a> begin their <a href="https://en.wikipedia.org/wiki/Mongol_siege_of_Kaifeng" id="mwLg" rel="mw:WikiLink" title="Mongol siege of Kaifeng">siege on Kaifeng</a>, the capital of the <a href="https://en.wikipedia.org/wiki/Jin_dynasty_(1115–1234)" id="mwLw" rel="mw:WikiLink" title="Jin dynasty (1115–1234)">Jin dynasty</a>.<sup about="#mwt30" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-4"}}' id="cite_ref-4" rel="dc:references" typeof="mw:Extension/ref"><a href="./April_8#cite_note-4" id="mwMA" style="counter-reset: mw-Ref 4;"><span class="mw-reflink-text" id="mwMQ">[4]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-4"><cite about="#mwt27" class="citation book cs1" id="CITEREFJaquesShowalter2007">Jaques, Tony; Showalter, Dennis E. (2007). <a class="external text" href="https://books.google.com/books?id=Dh6jydKXikoC" id="mwBzY" rel="mw:ExtLink nofollow"><i id="mwBzc">Dictionary of Battles and Sieges: A Guide to 8,500 Battles From Antiquity Through the Twenty-First Century</i></a>. Westport, Conn.: Greenwood Press. p.<span id="mwBzg" typeof="mw:Entity"> </span>502. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwBzk" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwBzo" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780313335365" id="mwBzs" rel="mw:WikiLink" title="Special:BookSources/9780313335365"><bdi id="mwBzw">9780313335365</bdi></a>.</cite><span about="#mwt27" class="Z3988" id="mwBz0" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Dictionary+of+Battles+and+Sieges%3A+A+Guide+to+8%2C500+Battles+From+Antiquity+Through+the+Twenty-First+Century&amp;rft.place=Westport%2C+Conn.&amp;rft.pages=502&amp;rft.pub=Greenwood+Press&amp;rft.date=2007&amp;rft.isbn=9780313335365&amp;rft.aulast=Jaques&amp;rft.aufirst=Tony&amp;rft.au=Showalter%2C+Dennis+E.&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DDh6jydKXikoC&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+8"></span></span>