efforts to impeach Andrew Johnson
... that before his 1868 impeachment, there had been several previous efforts to impeach Andrew Johnson?
... that before <a href="./Impeachment_of_Andrew_Johnson" id="mwAvQ" rel="mw:WikiLink" title="Impeachment of Andrew Johnson">his 1868 impeachment</a>, there had been several previous <b id="mwAvU"><a href="./Efforts_to_impeach_Andrew_Johnson" id="mwAvY" rel="mw:WikiLink" title="Efforts to impeach Andrew Johnson">efforts to impeach Andrew Johnson</a></b>?