 Complete the following phrase:  The Japanese occupation of Korea after annexation was largely uncontested militarily by the smaller, poorly armed, and poorly trained Korean army. Many rebels, former soldiers, and other volunteers left the Korean Peninsula for Manchuria and Primorsky Krai in Russia. Koreans in Manchuria formed resistance groups and guerrilla fighters known as Dongnipgun Independence Army, which traveled across the Korean-Chinese border, using guerrilla warfare tactics against Japanese forces. The Japanese invasion of Manchuria in 1932 and subsequent 