[3] On 28 May 1943 he has parachuted into highlands of Montenegro as representative of the British GHQ in the Middle East to the central command of the Yugoslav Partisans, who were led by Josip Broz Tito.
[4] Deakin's mission, codenamed Typical, joined Tito as the Partisans were being hunted through the gorges of the Tara River between the triple chains of mountain massifs of Mount Durmitor and Ljubišnja and canyons ravines of the region by German and Italian forces during Operation Schwarz.
Before the Second Session of AVNOJ, in Jajce (1943) the (by parachutes) and hung the English mission, William Deakin stayed with the Partisans in Petrovo Polje, today's municipality of Kneževo.
The latter was a detailed examination of German-Italian relations during World War II, and revealed Deakin not only as a formidable historian of diplomacy, but also, in his assessment of the death of Italian fascism, a notable political analyst.
[11] His memoir was published as The Embattled Mountain, the title referring to Mount Durmitor, the environs of which Deakin and Tito's army had been pursued over by German and Italian forces; see Battle of the Sutjeska.