Who did Mark Twain criticize after the boxer Rebellion?

In 1900, attacks took place across China in connection with the Boxer Rebellion which targeted Christians and foreigners. Many missionaries with their children, as well as native Christians were killed and much property was destroyed. While most missionaries, including those of the largest affected mission agency, the China Inland Mission led by Hudson Taylor, refused to even accept payment for loss of property or life "in order to demonstrate the meekness of Christ to the Chinese" when the allied nations were demanding compensation from the Chinese government, not all missionaries acted with similar restraint.