In July 1917, Jensen was temporarily promoted to corporal and transferred to the 13th Training Battalion at Codford in the UK as an instructor. While there, he was entertained by Danish residents of Kingston upon Hull. After another disciplinary infringement, he returned to France, rejoining his battalion on 6 October. He was temporarily promoted to sergeant in early November, and the battalion spent the winter of 1917–18 rotating through the front line. In late March 1918, the battalion left its rest area and, along with many other Australian units, was quickly deployed to meet the German Spring Offensive south of the River Ancre. On 5 April, the battalion took up positions at Dernancourt and there contributed to the defeat of the "largest German attack mounted against Australian troops during the war" during the Second Battle of Dernancourt.