MPs were in the House of Commons on a Saturday for the first time since 1982.
The last time it happened, Argentina had invaded the Falklands.
It was expected that MPs would be asked to decide if they would vote for Boris Johnson's Brexit deal - a deal which saw Theresa May's controversial backstop scrapped.
But instead, an amendment which forces the Prime Minister to write to ask for an extension was passed.
That amendment was put forward by a Conservative MP, Oliver Letwin, who said it was intended to be an insurance policy to stop an "accidental" no deal.
The Government had said that voting for the amendment was a vote for delay - and a defiant Mr Johnson told the Commons afterwards that he would not negotiate a further delay.
Guto Bebb, who had the Conservative whip withdrawn for voting against the Government, was one of 10 former Tory MPs who voted for the Letwin amendment. Others included former chancellor Philip Hammond and cabinet member Amber Rudd.
How every Welsh MP voted over the Letwin amendment
Aberavon: Stephen Kinnock (Labour)
Voted: For
Aberconwy: Guto Bebb (Independent)
Voted: For
Alyn & Deeside: Mark Tami (Labour)
Voted: For
Arfon: Hywel Williams (Plaid Cymru)
Voted: For
Blaenau Gwent: Nick Smith (Labour)
Voted: For
Brecon & Radnorshire: Jane Dodds (Lib Dem)
Voted: For
Bridgend: Madeleine Moon (Labour)
Voted: For
Caerphilly: Wayne David (Labour)
Voted: For
Cardiff Central: Jo Stevens (Labour)
Voted: For
Cardiff North: Anna McMorrin (Labour)
Voted: For
Cardiff South & Penarth: Stephen Doughty (Labour Co-op)
Voted: For
Cardiff West: Kevin Brennan (Labour)
Voted: For
Carmarthen East and Dinefwr: Jonathan Edwards (Plaid Cymru)
Voted: For
Carmarthen West and Pembrokeshire South: Simon Hart (Conservative)
Voted: Against
Ceredigion: Ben Lake (Plaid Cymru)
Voted: For
Clwyd South: Susan Elan Jones (Labour)
Voted: For
Clwyd West: David Jones (Conservative)
Voted: Against
Cynon Valley: Ann Clwyd (Labour)
Voted: For
Delyn - David Hanson (Labour)
Voted: For
Dwyfor Meirionnydd - Liz Saville Roberts (Plaid Cymru)
Voted: For
Gower - Tonia Antoniazzi (Labour)
Voted: For
Islwyn - Chris Evans (Labour)
Voted: For
Llanelli - Nia Griffith (Labour)
Voted: For
Merthyr Tydfil & Rhymney - Gerald Jones (Labour)
Voted: For
Monmouth - David Davies (Conservative)
Voted: Against
Montgomeryshire - Glyn Davies (Conservative)
Voted: Against
Neath - Christina Rees (Labour)
Voted: For
Newport East - Jessica Morden (Labour)
Voted: For
Newport West - Ruth Jones (Labour)
Voted: For
Ogmore - Chris Elmore (Labour)
Voted: For
Pontypridd - Owen Smith (Labour)
Voted: For
Preseli Pembrokeshire - Stephen Crabb (Conservative)
Voted: Against
Rhondda - Chris Bryant (Labour)
Voted: For
Swansea East - Carolyn Harris (Labour)
Voted: For
Swansea West - Geraint Davies (Labour)
Voted: For
Torfaen - Nick Thomas-Symonds (Labour)
Voted: For
Vale of Clwyd - Chris Ruane (Labour)
Voted: For
Vale of Glamorgan - Alun Cairns (Conservative)
Voted: Against
Wrexham - Ian Lucas (Labour)
Voted: For
Ynys Mon - Albert Owen (Labour)
Voted: For
