attempted
...that as Charles I of Austria attempted to regain the Hungarian throne in 1921, Czechoslovakia nearly entered Budapest in order to prevent a Habsburg restoration?
...that as <a href="./Charles_I_of_Austria" id="mwBvE" rel="mw:WikiLink" title="Charles I of Austria">Charles I of Austria</a> <b id="mwBvI"><a class="mw-redirect" href="./Charles_I_of_Austria's_conflict_with_Miklós_Horthy" id="mwBvM" rel="mw:WikiLink" title="Charles I of Austria's conflict with Miklós Horthy">attempted</a></b> to regain the <a href="./Hungary" id="mwBvQ" rel="mw:WikiLink" title="Hungary">Hungarian</a> throne in 1921, <a href="./Czechoslovakia" id="mwBvU" rel="mw:WikiLink" title="Czechoslovakia">Czechoslovakia</a> nearly entered <a href="./Budapest" id="mwBvY" rel="mw:WikiLink" title="Budapest">Budapest</a> in order to prevent a <a class="mw-redirect" href="./Habsburg" id="mwBvc" rel="mw:WikiLink" title="Habsburg">Habsburg</a> restoration?