The <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Kingdom_of_Hungary_(1920–46)" id="mwvg" rel="mw:WikiLink" title="Kingdom of Hungary (1920–46)">Hungarian</a> air force attacks the headquarters of the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Slovak_Air_Force_(1939–45)" id="mwvw" rel="mw:WikiLink" title="Slovak Air Force (1939–45)">Slovak air force</a> in <a href="https://en.wikipedia.org/wiki/Spišská_Nová_Ves" id="mwwA" rel="mw:WikiLink" title="Spišská Nová Ves">Spišská Nová Ves</a>, killing 13 people and beginning the <a href="https://en.wikipedia.org/wiki/Slovak–Hungarian_War" id="mwwQ" rel="mw:WikiLink" title="Slovak–Hungarian War">Slovak–Hungarian War</a>.