Mohammed Ahmed sent back details of the undercover passage into war-torn country after he arrived there from Handsworth
Mohammed Nahin Ahmed, 22, spent eight months in Syria last year after contacting Islamic extremists from his Handsworth home, asking for advice on how to get into the country from Turkey.
Once in Syria, the former postman then sent details of the route he took to a woman in Luton who was caught passing it on to an undercover police officer via a social media site.
Runa Khan, 34, from Luton, admitted posting Ahmed’s message on Facebook and other acts of encouraging terrorism.
They included posting a picture of a suicide vest with the words “sacrifice your life to be in Islam” in July last year.
Kingston Crown Court in Surrey heard how on September 13 last year the mother-of-six, of Maple Road West, sent a series of messages on Facebook detailing the secret path into Syria and the name of a rebel group in the country to join.
It was the same group that Ahmed and his childhood friend Yusuf Sarwar, also 22, had joined after making the trip from their homes in Birmingham.
The net closed in on them after Sarwar’s family reported him missing in May last year when they found a handwritten letter from him saying he had left to join a terrorist group called Kataib al-Muhajireen (KaM) to take part in jihad.
Days earlier he had told his family he was travelling to Turkey for a two-week trip organised by Birmingham City University, where he was a part-time computer science student.
West Midlands Police counter-terror unit officers searched the homes of Ahmed and Sarwar and found an online conversation between Ahmed and a Swedish national fighting with the KaM during which Ahmed wrote on Skype: “I come to join KaM.”
The Swede replied: “Inshallah (God willing)”.
Ahmed and Sarwar were arrested at Heathrow by police on their return to the UK in January.
The pair were coaxed home by their concerned families, who put pressure on them to return to Britain.
After their arrest the pair told officers their trip had been for humanitarian reasons. But police found thousands of images of them with guns on a digital camera.
Traces of military-grade explosives, including TNT and nitroglycerine, were also found on their clothes and trainers.
Last month at Woolwich Crown Court, Ahmed and Sarwar both admitted preparing to carry out terrorist acts and are awaiting sentence.
Runa Khan was granted bail with conditions including not to use Facebook and will be sentenced in September.