World War I: During a <a href="https://en.wikipedia.org/wiki/Mines_on_the_Italian_front_(World_War_I)" id="mwmA" rel="mw:WikiLink" title="Mines on the Italian front (World War I)">mine warfare in high altitude</a> on the <a href="https://en.wikipedia.org/wiki/Dolomites" id="mwmQ" rel="mw:WikiLink" title="Dolomites">Dolomites</a>, the Italian troops conquer the Col di Lana held by the Austrian army.<sup about="#mwt34" 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_18#cite_note-4" id="mwmg" style="counter-reset: mw-Ref 4;"><span class="mw-reflink-text" id="mwmw">[4]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-4"><cite about="#mwt31" class="citation book cs1" id="CITEREFThompson,_Mark2009">Thompson, Mark (2009). <i id="mwBQs">The White War: Life and Death on the Italian Front, 1915-1919</i>. Faber &amp; Faber.</cite><span about="#mwt31" class="Z3988" id="mwBQw" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=The+White+War%3A+Life+and+Death+on+the+Italian+Front%2C+1915-1919&amp;rft.pub=Faber+%26+Faber&amp;rft.date=2009&amp;rft.au=Thompson%2C+Mark&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AApril+18"></span></span>