evacuation hospital; clearing hospital
Military medical term for a hospital that receives and treats patients evacuated from the front or from other facilities, often for stabilization before further transfer.
The wounded soldiers were taken to the evacuation hospital.
At the clearing hospital, patients are received from the front lines and, if necessary, transferred to hospitals further to the rear.
野戦病院 is a field hospital set up close to combat zones for immediate treatment, while 後送病院 is further back and focuses on receiving evacuated patients for stabilization and further transfer.
Compound of 後送 (こうそう, 'evacuation, sending to the rear') and 病院 (びょういん, 'hospital'). The term is primarily used in military contexts.