A search of an impounded car, stopped by a traffic officer on the M1, revealed a cache of weapons belonging to the gang who planned to attack an EDL march in Dewsbury, West Yorkshire.
There were also 10 copies of a hate-filled note addressed to the enemies of Islam, the Queen and Prime Minister David Cameron.
It said: "This is a message to the enemies of Allah and his messenger. This is a message to the kafir (non-believer) female devil and self-proclaimed Queen Elizabeth and her accursed jubilee, fooling a nation of blind sheep to your self-proclaimed royalty and majesty."
The document addressed the EDL directly, saying: "To the EDL (English Drunkards League). O enemies of Allah! We have heard and seen you openly insulting the final Messenger of Allah... you should know that for every action there is a reaction.
"Today is a day of retaliation (especially) for your blasphemy of Allah and his Messenger Muhammad. We love death more than you love life. The penalty for blasphemy of Allah and his Messenger Muhammad is death.
A gang of six men pleaded guilty to an attack that - but for a piece of good luck - would have resulted in large numbers of casualties.
A plot by six men from Birmingham to attack an EDL rally in Dewsbury was uncovered by "pure chance", police have said.
Six men accused of preparing to carry out an attack on a rally of the right wing group the EDL have pleaded guilty at Woolwich crown court.