#117 1917 · Egyptian Expeditionary Force (British military intelligence, Sinai and Palestine campaign) · Military deceptionwrong-door
British intelligence got the enemy to trust fake plans by making them work to steal them
the problem
An adversary who suspects deception discounts anything handed to them directly — the harder a piece of information is pushed at someone, the more they doubt it, which makes deliberately planted disinformation almost useless once a target is on guard for it
background
After two failed British assaults on Gaza in 1917, Ottoman and German commanders under Friedrich Kress von Kressenstein were alert to British intentions and skeptical of any information that came to them too easily — exactly the condition that makes direct disinformation (a leaked document, a forged order) unpersuasive, because a wary adversary assumes anything offered outright might be a plant. British intelligence needed the Ottomans to believe the next attack would fall on Gaza again, while the real assault was being prepared against the weaker position at Beersheba.
Rather than transmit false plans through a channel the enemy might suspect, a British officer rode into contested ground near Ottoman lines and, in the course of drawing enemy fire and retreating, appeared to accidentally drop a haversack containing apparently genuine but falsified operational documents pointing to a renewed attack on Gaza. Ottoman forces had to find, retrieve, and independently authenticate the documents themselves — information obtained through the enemy's own effort reads as far more credible than anything handed over directly.
the move
The ruse relied on the target doing the work of 'discovering' the deception rather than being told it — von Kressenstein reportedly harbored some doubt about the documents' authenticity, but the requirement to independently verify effort-earned intelligence, rather than dismiss an unsolicited claim, was enough to shift Ottoman force deployment toward defending Gaza more heavily, thinning the defense at Beersheba where the real attack came.
the payoff
British and Anzac forces took Beersheba on 31 October 1917 against a defense weighted toward the wrong sector, a result multiple accounts credit at least partly to the successful misdirection of Ottoman and German command attention toward Gaza, opening the path for the subsequent capture of Jerusalem later that year.
what came after
The Haversack Ruse is a foundational case study in military deception doctrine for the specific technique of 'lost' rather than 'delivered' disinformation, though postwar credit for conceiving it has been disputed — the most widely repeated version attributes it to intelligence officer Richard Meinertzhagen, whose self-authored accounts of his own exploits have been challenged by later historians as embellished or fabricated, while some historians trace the operational idea instead to fellow officers Belgrave and Neate. The underlying deception and its battlefield effect are independently corroborated by Ottoman and German command records; the individual credit for devising it is not.
references
- [1]Warfare History Network — The Haversack Ruse In Gaza Impressed Even Lawrence Of ArabiaWarfare History Network, 2020warfarehistorynetwork.com
- [2]Wikipedia — Third Battle of GazaWikipedia, 2026en.wikipedia.org
Widely retold and only partly documented — filed as hearsay, like the sibling archive does.