RAF bombing raids have begun in Syria with Tornado jets hitting oil wells in the east of the country.
Defence Secretary Michael Fallon has said the raids have dealt a "real blow" to Islamic State.
But the raids have faced strong opposition from campaigners, and 65% of readers taking part in our poll yesterday were against the air strikes.
Four RAF Tornado jets carrying Paveway IV guided bombs took off from the UK's Akrotiri base in Cyprus shortly after the late-night vote in the Commons, to carry out attacks in Syriain the early hours of the morning.
A Ministry of Defence spokesman said the planes had returned from the "first offensive operation over Syria and have conducted strikes".
MPs voted by 397 to 223 - a majority of 174 - in favour of extending British action against IS into its Syrian strongholds.
Sunderland MP Bridget Phillipson was among 66 Labour MPs who voted in favour of the strikes.
Prime Minister David Cameron has said MPs took the "right decision to keep the UK safe".