If the government avoids defeat, is Brexit a done deal?
The government will now enter talks with rebels about accepting a new amendment which would give MPs an effective veto on the Brexit deal May secures from the EU.
The Labour Party's Chuka Umunna, who backed staying in the European Union, welcomed the concession as the end of the government threatening to allow Britain to crash out of the European Union without a deal. That has potentially seismic consequences for the protracted and increasingly messy split from Brussels.
The government concession is all the more remarkable because of the strength of opposition to the original amendment from ministers.
Next up are the July votes on the trade and customs bills where rebels will aim to force the Government to keep the United Kingdom in the customs union.
Earlier May suffered a setback when junior justice minister Phillip Lee, who has always been critical of Brexit strategy, resigned and said he would vote against the government.More news: Unlike Singapore, South Korean F&B firms careful about Trump-Kim marketing
And what if the Brexiters force May to renege on her putative pledge to the Remainer rebels?
Dismissing claims that Mrs May had effectively abandoned her threat that the United Kingdom could leave the European Union without a deal, Mr Jenkin said: "There is only agreement for discussions, not concessions".
Dominic Grieve tabled an amendment last night which forced the government's hand over the issue of a meaningful vote.
But while the well-worn arguments focusing on the nature of a meaningful vote were made, the real drama was taking place on the floor of the chamber where chief whip Julian Smith, solicitor general Robert Buckland and Brexit secretary David Davis as well as the Prime Minister's parliamentary private secretary (PPS) George Holingberry were in deep discussion with each other and Grieve, as they sought to avert an embarrassment for the government. The bill then returns to the House of Commons again later next week.
They also voted to disagree with Lords amendment 37, which was part of an attempt to remove the exit day from the Bill and allow the Commons to rethink its approach.
In the event, Dr Lee abstained on the crucial vote, saying he was "delighted" the Government had agreed to introduce an amendment giving Parliament "the voice I always wanted it to have in the Brexit process".More news: Assad Denies Moscow Dictates in Syria
"I can not support the government's decision to oppose this amendment because doing so breaches such fundamental principles of human rights and parliamentary sovereignty", he said.
Earlier, May appeared to have also stemmed a rebellion on Wednesday over her commitment to leaving the EU's customs union which will transform Britain's trading relationships for decades to come.
Mrs May is coming under increasing pressure from European Union negotiators to come up with detailed positions not only on customs, but also on future trade relations and governance.
The government says the changes would weaken Britain's negotiating position and is seeking to reverse them in the Commons.
"We will be talking to the government immediately after this in order to find a common way forward".
Pro-EU lawmakers, however, welcomed it as a signal that the government was moving towards ruling out a hardline "no deal" Brexit. How Brexiteers react to that prospect could determine how long this Government survives.More news: P.E.I. premier supports Trudeau trade retaliation
The prime minister still has time to come up with a form of words acceptable to both sides, but the expectations of the anti-Brexit rebels have been raised significantly. Theresa May has said no British government would ever agree to a hard border there. Yes, it's a significant compromise but we live to fight another day. "There could be a confidence motion [in the prime minister] or an early general election".