Country reasoning

Context

Bulgaria entered the war in 1915 on the side of the Central Powers, seeking territorial expansion in the Balkans. Its forces were primarily engaged against Serbia and Allied forces in the region.

Rationale used for numbers used on the war statistics page

Measure	Selected value	Selected source	Rationale
Population (baseline)	4,500,000	ww1-source-book The World War One Source Book

What sources report

Military deaths

Source	Value	Scope / notes	Citation
ellis_cox_1993 The World War I Databook John Ellis; Michael Cox • Aurum Press • 1993 medium	77,450	—	Ellis, John & Cox, Michael. The World War I Databook. London: Aurum

Mobilized / served

Source	Value	Scope / notes	Citation
ellis_cox_1993 The World War I Databook John Ellis; Michael Cox • Aurum Press • 1993 medium	1,200,000	—	Ellis, John & Cox, Michael. The World War I Databook. London: Aurum

Population (baseline)

CWVMP uses: 4,500,000 from ww1-source-book

Source	Value	Scope / notes	Citation
ellis_cox_1993 The World War I Databook John Ellis; Michael Cox • Aurum Press • 1993 medium	5,500,000	—	Ellis, John & Cox, Michael. The World War I Databook. London: Aurum
ww1-source-book The World War One Source Book Philip J. Haythornthwaite • Arms and Armour, London • 1993 medium	4,500,000	—	—
wikipedia-ww1 World War I casualties 2026 medium	4,500,000	—	— Source link (accessed 2026-02-01)

POW

Source	Value	Scope / notes	Citation
ellis_cox_1993 The World War I Databook John Ellis; Michael Cox • Aurum Press • 1993 medium	150,000	—	Ellis, John & Cox, Michael. The World War I Databook. London: Aurum

Wounded

Source	Value	Scope / notes	Citation
ellis_cox_1993 The World War I Databook John Ellis; Michael Cox • Aurum Press • 1993 medium	152,400	—	Ellis, John & Cox, Michael. The World War I Databook. London: Aurum

Editorial principles in selecting the figures to use

No rationale narrative yet for this country/conflict.

Discussion of discrepancies

No discussion narrative yet for this country/conflict.

Bulgaria — WW1