Orwell was declared "unfit for any kind of military service" by the Medical Board in June, but soon afterwards found an opportunity to become involved in war activities by joining the Home Guard. He shared Tom Wintringham's socialist vision for the Home Guard as a revolutionary People's Militia. His lecture notes for instructing platoon members include advice on street fighting, field fortifications, and the use of mortars of various kinds. Sergeant Orwell managed to recruit Fredric Warburg to his unit. During the Battle of Britain he used to spend weekends with Warburg and his new Zionist friend, Tosco Fyvel, at Warburg's house at Twyford, Berkshire. At Wallington he worked on "England Your England" and in London wrote reviews for various periodicals. Visiting Eileen's family in Greenwich brought him face-to-face with the effects of the Blitz on East London. In mid-1940, Warburg, Fyvel and Orwell planned Searchlight Books. Eleven volumes eventually appeared, of which Orwell's "", published on 19 February 1941, was the first.