A pamphlet warning Britons to leave the Middle East or face death has come to light in a stash of illicit propaganda.

The document does not hail from Basra or Baghdad, nor was it penned by the Islamists of al-Qaeda or the al-Mahdi Army. It was found in Haifa, about 60 years ago, and it was issued by the underground group led by Menachem Begin – the future Prime Minister of Israel and winner of the Nobel Peace Prize.

The document, which surfaced at an auction house this week, is addressed to “the soldiers of the occupation army” and aimed at British soldiers serving in Palestine, then under the British Mandate, preceding the establishment of Israel in 1948. The print has faded and the paper has discoloured since it was unearthed from a grove of trees in Haifa in the summer of 1947. Yet the language and the concerns remain current.

Bombings and murders by underground groups, such as Begin’s Irgun, hastened the British withdrawal and the United Nations declaration that led to the founding of modern Israel.

Irgun propaganda targeted the British Army’s wavering morale, already dented by the bomb attack on the Mandate’s headquarters – the King David Hotel in Jerusalem – which killed 91 people.

In the document, Irgun tells British troops: “It is unavoidable that many Jewish soldiers and many British soldiers should fall. And it is only fair that these people know at least why they may be killed.”

It adds: “Most of you have been in this country for quite a long time. You have learned what the word ‘terrorist’ means, some of you may even have come into direct contact with them (and heartily desire not to repeat the experience). But what do you know about them? Why does a young man go underground?”

It then draws a parallel with what would have happened if, seven years earlier, Britain had been overrun by Nazi Germany. “Remember 1940. Then it seemed quite possible that your island country would be conquered and subjugated by Hitler hordes . . . what would you have done? Would you have gone underground?” The pamphlet says that the occupation is “illegal and immoral” and “parallel to the mass assassination of a whole people”, in language that echoes that used on a note pinned to the booby-trapped bodies of two British intelligence officers executed by Irgun that same summer.

The pamphlet came from a stash confiscated and burnt by cyptographers from the Royal Signals regiment. Corporal Raymond Smith found them buried in a secluded grove marked by a white Star of David and was ordered to destroy them, but took one as a memento. A collector acquired the document from Corporal Smith, and brought it to Mullock’s auctioneers in Shropshire.

Richard Westwood-Brookes, Mullock’s historical documents specialist, said the pamphlet was a remarkable find, which “ amounted to a manifesto for terrorist action”. He added: “It also raises the question as to who are ‘terrorists’ and who are ‘freedom fighters’. It’s a debate which raged through the troubles of Northern Ireland and continues in the Middle East.”

Begin’s Irgun set aside its differences with Haganah, a rival underground Jewish group led by David Ben Gurion – the first Prime Minister of Israel, who once likened Begin to Adolf Hitler.

Begin forged a political career as a hardliner, but, after becoming Prime Minister, signed the Camp David agreement with Egypt in 1979.

The pamphlet, which is expected to fetch about £500, goes on sale at Mullock’s, in Shropshire, on August 6.