Brighton Kemp Town MP Des Turner and Brighton Pavilion MP David Lepper voted against their own Labour Government to support the rebel amendment.
Chichester Tory MP Andrew Tyrie and Lewes Liberal Democrat Norman Baker also voted with the 199 MPs who said the case for war had yet to be proved.
Labour MPs Ivor Caplin (Hove), Laura Moffatt (Crawley) and Michael Foster (Hastings) voted in favour of the Government motion, warning Saddam Hussein he had been given "final opportunity" to disarm.
The Government was also backed by the remaining Conservative MPs in Sussex.
They were Bexhill and Battle's Gregory Barker, Worthing West's Peter Bottomley, Arundel and South Downs' Howard Flight, Bognor's Nick Gibb, Wealden's Charles Hendry, East Worthing and Shoreham's Tim Loughton, Horsham's Francis Maude and Mid Sussex's Nicholas Soames.
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