ORDER OF BATTLE // November 19, 1809
Battle of Ocaña
Estimated force strength by side, with confidence labels per surviving record.
Forces engaged
2 sides catalogued · combined 68,000–72,000 estimated
France
24,000–27,000
Medium-confidence figure
Spain
44,000–45,000
Medium-confidence figure
Battle context
The Battle of Ocaña represented the most severe single defeat suffered by Spanish forces during the Peninsular War. Despite holding a substantial numerical advantage — roughly 44,000–45,000 troops against a French force of 24,000–27,000 — Aréizaga's army sustained casualties of 4,000–5,000 against French losses of only 1,700–2,000. The scale of the defeat effectively dismantled one of the largest Spanish field armies assembled to that point in the conflict, sharply reducing Spain's capacity for conventional offensive operations. Command fell on the French side to Marshal Soult, with Joseph Bonaparte present, underscoring the strategic weight attached to the engagement. By eliminating this army as a coherent fighting force, Ocaña opened the path into Andalusia and fundamentally altered the balance of the ground war in the southern theater of the Peninsular conflict.
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