Aerial reconnaissance can be used for artillery spotting.
Notes on verification
Well-documented historical fact corroborated by multiple independent sources including museum records and historical archives; also consistent with modern military practice.
Sources
- Aerial reconnaissance (en.wikipedia.org)
- https://www.warmuseum.ca/firstworldwar/history/battles-and-fighting/air-war/aerial-reconnaissance/ (warmuseum.ca)
- https://warhistory.org/@msw/article/wwi-spotting-for-the-armys-big-guns-i (warhistory.org)
- https://www.firstworldwar.com/airwar/observation.htm (firstworldwar.com)