In total 47 Labour MP's rebelled against their party leader's three-line whip in order to vote against the Government's Brexit Bill.
Jeremy Corbyn's instructions to party members, telling them to vote in favour of the bill, had caused division within the party and even led to the resignations of members of his shadow cabinet.
But which of Corbyn's MP's defied him and why?
The MPs that rebelled against Corbyn
Some of the reasons given for rebelling
I believe in the form of democracy that never silences minorities and I think the 48% in this country have a right to a voice and for that matter the 46% or the 45% or whatever the actual figure was in my constituency.
The problem with the position taken by both front benches by triggering early, we are going to be on an escalator in one direction with no ability to get off.
I do not believe that the Brexit course we are now set on will make Britain a more prosperous, fairer, more equal, tolerant country. I believe, by contrast, that it will make our politics meaner, and it will make our country poorer.
Despite the rebellion the bill was ultimately passed in commons with a majority of 384 votes in favour.
Labour party reaction
The Labour party has highlighted the fact its MPs "voted more than three to one in favour of triggering Article 50".
A spokesperson for Corbyn said: "Labour MPs voted more than three to one in favour of triggering Article 50.
“Now the battle of the week ahead is to shape Brexit negotiations to put jobs, living standards and accountability centre stage.
“Labour’s amendments are the real agenda. The challenge is for MPs of all parties to ensure the best deal for Britain, and that doesn’t mean giving Theresa May a free hand to turn Britain into a bargain basement tax haven.”