I want to know the answer to the following question:
What natural obsticles stalled the Japanese offensive against the Chinese?
All the background I'm provided with is that "The Japanese found its aggression against the retreating and regrouping Chinese army was stalled by the mountainous terrain in southwestern China while the Communists organised widespread guerrilla and saboteur activities in northern and eastern China behind the Japanese front line.". Is that enough to answer the question?
Answer: yes