CASUALTY RECORD // June 24, 1866
Battle of Custoza
Estimated casualties — killed, wounded, captured, and missing — by side, with confidence labels per surviving record.
Casualties by side
2 sides catalogued · combined 6,802 estimated
Kingdom of Italy
3,112
Medium-confidence figure
Austrian Empire
3,690
Medium-confidence figure
Battle context
The 1866 Battle of Custoza was a defeat for the Kingdom of Italy during the Third Italian War of Independence, fought as part of the broader Italian unification process. Despite fielding approximately 120,000 troops against an Austrian force of roughly 75,000, the Italian army under Alfonso La Marmora was repulsed by Austrian forces commanded by Archduke Albrecht and Franz Freiherr von John. The engagement marked the second time Italian forces suffered a defeat at Custoza, following an earlier loss at the same location during the 1848 unification campaigns. Austrian casualties of around 3,690 exceeded Italian losses of approximately 3,112, yet the battlefield outcome remained a setback for Italian arms.
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