evidence: The period of heightened Chinese anxiety around the two-front threat in the 1950-60s also saw a spike in clashes along the India-China border. It was the most unstable and volatile period in the history of India-China relations. In 1955-56, there were a large number of Chinese incursions which India protested.[19] In July 1958, the PLA forcibly occupied the Khurnak Fort in eastern Ladakh. In September, it detained an Indian patrol party in Ladakh’s Aksai Chin for nearly five weeks.[20] There were also incursions in the eastern and middle sectors such as Lohit (Arunachal Pradesh), Lapthal and Sangch Malla (Uttarakhand.)[21]