to submit to the journal, and met with the prominent French archaeologist Henri Breuil on the latter's visit to Cambridge. In the summer of 1936, Clark married Mollie in St Peter's Church, Chichester. They then embarked on a honeymoon in Norway and Sweden, looking at the region's prehistoric rock art, on the subject of which Clark then produced an illustrated article for Antiquity. Later that year, the couple and Philips embarked on a road trip across northern Europe, visiting archaeological sites like the Danevirke and the Nydam Boat. In Germany they spent time at the Schleswig Museum and met with Gustav Schwantes, who took them to visit Alfred Rust's excavation of a Mesolithic site at Meiendorf. Clark and Rust got on well and remained in contact for many years. Crossing to Denmark, the trio were involved in a car crash near to Randers, with the Clarks requiring hospitalisation for three weeks. In 1936, Cambridge University Press published Clark's The Mesolithic Settlement of Northern Europe, in which he demonstrated his growing interest in ecological and environmental themes. The book established Clark as being at the forefront of Mesolithic archaeology, and was hailed as an important and trend-setting tome which would influence generations of Mesolithic archaeologists before eventually becoming outdated due to more detailed research. In 1939 Methuen and Co published Clark's Archaeology and Society. This was a textbook that outlined how to understand past societies through archaeology, and expressed the view that archaeology could be a force for peace in the world by promoting notions of human unity. In the book he condemned Soviet archaeology, believing that the Soviet government had forced archaeologists to support their pre-conceived Marxist ideas about societal and economic development. He also condemned the use of archaeology in Nazi Germany and Fascist Italy, claiming that they used archaeology to promote a "diseased nationalism". Published to good reviews, the book was read widely and revised editions were published in 1947 and 1952. According to the historian of archaeology Pamela Jane Smith, it became "one of Clark's most widely read and respected publications." Second World War: 1939–45 Clark's archaeological career was put on hold during the Second World War. While awaiting enlistment into the British armed forces, Clark took lessons in Russian with Minns in order to enable him to read Soviet archaeological publications. He was then drafted into the Royal Air Force (RAF) Volunteer Reserve as a pilot