Although the British Joint Operations Department is quite experienced in the operation of death squads, it is the first time to send special commandos to Norway to complete such a difficult task. Scandinavian mountains run through Norway, and every peak is full of danger of life and death. The unpredictable airflow over Scandinavia near the polar regions makes Norway the most unfavorable country in Europe to launch an attack with airborne gliding troops. As one of the important preparations for the attack, the Special Operations Department made a target model based on Einar's intelligence and with the assistance of Dr. Liver, whose position and structure were the same as those of the important facilities and workshops in the real Weimock Chemical Plant. In this way, the "Swallow" action plan was finally organized.