Former warrant officer John Geddes, 60, said victims of any new London Bridge-style terror attack should act like football hooligans by ganging together and using whatever makeshift weapons came to hand.
In a book due out in August he said anything from a pint glass to tables, chairs and sun umbrellas can be turned into life-saving weapons.
Even a laptop bag could knock a terrorist off balance and give victims time to escape.
An SAS veteran today revealed a series of tips on how to defeat knife-wielding terrorists
On Saturday night members of the public defended themselves from the three London Bridge terrorists by hurling chairs, tables and drinks at them.
Mr Geddes, a former paratrooper who spent 14 years in the SAS, said the worst option is to just lie on the floor and hope not to be noticed.
He detailed his tips on how to fight back in his book Be A Hero: The Essential Guide to Active Shooter Incidents co-written with former Daily Express journalist Alun Rees.
Mr Geddes, from Hereford, said everyday objects can be the difference between life and death.
John Geddes said victims of any new London Bridge-style terror attack should act like hooligans
He said: “For a moment you have to become a group of football hooligans. You have to become momentarily medieval and fight in a group.
They bleed the same as you – they are only human
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“You have to pick up whatever is around and throw it. You can only run so far and so fast – and for some people that isn’t an option, so you have to fight.
“If you are in a restaurant you’ve got knives, forks, chairs and bottles. Throw them at the attacker and overpower them.
“They bleed the same as you – they are only human. Pick up a table with others and throw it at them and follow it up with whatever you club you can find.
A pint glass can do a lot of damage if wielded correctly
“A pint pot – we all know the damage some idiot in the pub can do with that. That’s what people have to do collectively to defeat these perpetrators.
“Cold drinks are good too. Just throw them in his face, especially if they come in a good volume like a beer. Liquid – of any sort – in the face is a big impediment to action.”
He said a coffee cup “hurled into the perpetrator’s face” could “scald and blind him” while table umbrellas make a good lance.
And he said when using these weapons you should “go for the face.”
He said one of the most useful weapons in a knife-attack is a chair or stool held out in front.
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Armed police responding to the incident at London Bridge
A computer bag is “heavy and can make a devastating weapon” and if cornered can be used to protect from blows.
He wrote: “When danger threatens, don’t forget it’s there on your shoulder ready to be deployed.
“Use it to keep a knifeman at bay, or if you come from his lank, smash him on the head with it.
“Move side to side as you counter the blows aimed at you.
A computer bag is 'heavy and can make a devastating weapon'
“Avoid moving backwards because, sooner or later, you are going to fall over something allowing the attacker to come above you and attack.”
He added: “The very worst thing you can do is hide on the floor in the proximity of the attacker.
“If that’s what you do then you are going to be stabbed and shot.”
• Be A Hero: The Essential Guide to Active Shooter Incident, co-written with Alun Rees, is out on August 1 and currently available to pre order on Amazon for £11.67