 During the war, she wrote her trilogy of historical novels - "Cry Treason" (1940), "We Stood For Freedom" (1941) and "The Mighty Years" (1943) - with James Scott, the Duke of Monmouth, and William III, as central characters.Jacob was away for two years at this time reporting from various war zones.She accompanied her husband to Moscow in January 1944 and wrote her work "Soviet Ballet" published in 1945.