I want to know the answer to the following question:
In what time period did the most brutal battles occur?
All the background I'm provided with is that "The majority of the fighting ended in 1920 with the defeat of General Pyotr Wrangel in the Crimea, but a notable resistance in certain areas continued until 1923 (e.g., Kronstadt Uprising, Tambov Rebellion, Basmachi Revolt, and the final resistance of the White movement in the Far East).". Is that enough to answer the question?
Answer: no