A map of troop movements in the lead up to the Jinan incident, April–May 1928.
Own work
This file was derived from:

 Hydrogeological map - symbol - drainage gallery (COLOR).svg
BlankMap-World5.svgDerived from;

OSMInformation from:

The Northern Expedition: China's National Revolution of 1926–1928, page 180 by Donald A. Jordan
RGloucester
Goran tek-en, following request by RGloucester