The United States <a href="https://en.wikipedia.org/wiki/Capture_of_Guam" id="mwcA" rel="mw:WikiLink" title="Capture of Guam">captures Guam</a> from Spain. The few warning shots fired by the U.S. naval vessels are misinterpreted as salutes by the Spanish garrison, which was unaware that the two nations were at war.<sup about="#mwt28" 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="./June_21#cite_note-3" id="mwcQ" style="counter-reset: mw-Ref 3;"><span class="mw-reflink-text" id="mwcg">[3]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-3"><cite about="#mwt22" class="citation book cs1" id="CITEREFBarnes2010">Barnes, Mark (2010). <i id="mwCCg">The Spanish–American War and Philippine Insurrection, 1898–1902: An Annotated Bibliography</i>. Florence, Ky.: Taylor &amp; Francis. p.<span id="mwCCk" typeof="mw:Entity"> </span>xv. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwCCo" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwCCs" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780415999571" id="mwCCw" rel="mw:WikiLink" title="Special:BookSources/9780415999571"><bdi id="mwCC0">9780415999571</bdi></a></cite><span about="#mwt22" class="Z3988" id="mwCC4" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=The+Spanish%E2%80%93American+War+and+Philippine+Insurrection%2C+1898%E2%80%931902%3A+An+Annotated+Bibliography&amp;rft.place=Florence%2C+Ky.&amp;rft.pages=xv&amp;rft.pub=Taylor+%26+Francis&amp;rft.date=2010&amp;rft.isbn=9780415999571&amp;rft.aulast=Barnes&amp;rft.aufirst=Mark&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJune+21"></span>; <link about="#mwt25" data-mw="{&quot;name&quot;:&quot;templatestyles&quot;,&quot;attrs&quot;:{&quot;src&quot;:&quot;Module:Citation/CS1/styles.css&quot;},&quot;body&quot;:{&quot;extsrc&quot;:&quot;&quot;},&quot;parts&quot;:[{&quot;template&quot;:{&quot;target&quot;:{&quot;wt&quot;:&quot;cite book&quot;,&quot;href&quot;:&quot;./Template:Cite_book&quot;},&quot;params&quot;:{&quot;last&quot;:{&quot;wt&quot;:&quot;Schoonover&quot;},&quot;first&quot;:{&quot;wt&quot;:&quot;Thomas David&quot;},&quot;title&quot;:{&quot;wt&quot;:&quot;Uncle Sam's War of 1898 and the Origins of Globalization&quot;},&quot;location&quot;:{&quot;wt&quot;:&quot;Lexington, Ky.&quot;},&quot;publisher&quot;:{&quot;wt&quot;:&quot;University Press of Kentucky&quot;},&quot;date&quot;:{&quot;wt&quot;:&quot;2003&quot;},&quot;isbn&quot;:{&quot;wt&quot;:&quot;9780813122823&quot;},&quot;url&quot;:{&quot;wt&quot;:&quot;https://books.google.com/books?id=JpsRZqopiN4C&quot;},&quot;page&quot;:{&quot;wt&quot;:&quot;89&quot;}},&quot;i&quot;:0}}]}" href="mw-data:TemplateStyles:r1215172403" id="mwCC8" rel="mw-deduplicated-inline-style" typeof="mw:Extension/templatestyles mw:Transclusion"/><cite about="#mwt25" class="citation book cs1" id="CITEREFSchoonover2003">Schoonover, Thomas David (2003). <a class="external text" href="https://books.google.com/books?id=JpsRZqopiN4C" id="mwCDA" rel="mw:ExtLink nofollow"><i id="mwCDE">Uncle Sam's War of 1898 and the Origins of Globalization</i></a>. Lexington, Ky.: University Press of Kentucky. p.<span id="mwCDI" typeof="mw:Entity"> </span>89. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwCDM" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwCDQ" typeof="mw:Entity"> </span><a href="./Special:BookSources/9780813122823" id="mwCDU" rel="mw:WikiLink" title="Special:BookSources/9780813122823"><bdi id="mwCDY">9780813122823</bdi></a>.</cite><span about="#mwt25" class="Z3988" id="mwCDc" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=book&amp;rft.btitle=Uncle+Sam%27s+War+of+1898+and+the+Origins+of+Globalization&amp;rft.place=Lexington%2C+Ky.&amp;rft.pages=89&amp;rft.pub=University+Press+of+Kentucky&amp;rft.date=2003&amp;rft.isbn=9780813122823&amp;rft.aulast=Schoonover&amp;rft.aufirst=Thomas+David&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DJpsRZqopiN4C&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AJune+21"></span></span>