The Government was concerned about this at one stage, especially as Labour were voting with the rebels.
But in the end they won by a fairly comfortable - if reduced - majority of 54.
There was some fairly efficient tactical skirmishing to pick off rebels one by one with concessions, the most important of which is that they will have to now report to Parliament about how the reserves are functioning in the years ahead.
But a victory for the Government tonight and their reforms go forward.
More top news
Deputy Prime Minister Nick Clegg launched his election battlebus today with an attack on the Conservative Party.
The rain band will soon be clearing eastwards, but more showers will be affecting parts of the UK this afternoon.
David Cameron will stand down as Conservative leader ahead of the general election expected in 2020, Iain Duncan Smith said.