On 21 March 1918, the German Army started its Spring Offensive on the Western Front. A week later, Rosenberg sent his last letter with a poem "Through These Pale Cold Days" to England before going to the front lines with reinforcements. Having just finished a night patrol, he was killed on the night of 1 April 1918 with another ten KORL soldiers; there is a dispute as to whether his death occurred at the hands of a sniper or in close combat. In either case, he died in a town called Fampoux, north-east of Arras. He was first buried in a mass grave, but in 1926 the unidentified remains of the six KORL soldiers were individually re-interred at Bailleul Road East Cemetery, Plot V, Saint-Laurent-Blangy, Pas de Calais, France. Rosenberg's gravestone is marked with his name and the words, "Buried near this spot", as well as – "Artist and Poet".