 Under the cover of the Office of the Eighth Route Army (moved to a stately building on the outskirts of Chongqing), Zhou adopted a series of measures to expand the CCP intelligence network.By the time that Zhou returned to Chongqing in May 1940, a serious rift had formed between the KMT and the CCP.Over the course of the next year, the relationship between the two parties degenerated into arrests and executions of Party members, covert attempts by agents of both sides to eliminate each other, propaganda efforts attacking each other, and major military clashes.