Key Facts
- Duration
- 26 February – 18 July 1806 (~5 months)
- Besieging force
- Imperial French Army of Naples
- Defending garrison
- Neapolitan forces under Hesse-Philippsthal
- Key consequence
- French reinforcements withheld, enabling Battle of Maida
- Outcome
- Gaeta surrendered; garrison granted generous terms
Strategic Narrative Overview
Masséna's corps invested Gaeta beginning in late February 1806, but the garrison mounted a fierce defense that lasted nearly five months. Hesse-Philippsthal was severely wounded during the resistance. The prolonged siege tied down a large portion of the Army of Naples, preventing Masséna from reinforcing French columns in Calabria. This enabled a British expeditionary force under John Stuart to land and defeat Jean Reynier's French army at the Battle of Maida in July 1806.
01 / The Origins
When King Ferdinand IV of Naples joined the Third Coalition against France, Napoleon responded by ordering an invasion of the Kingdom of Naples. French forces rapidly overran the kingdom, but the fortress city of Gaeta, commanded by General Louis of Hesse-Philippsthal, refused to capitulate. Marshal André Masséna was tasked with reducing the stronghold as part of the broader campaign to consolidate French control over southern Italy.
03 / The Outcome
French artillery eventually breached the city's defensive walls, forcing Gaeta's surrender on 18 July 1806. Masséna granted the garrison generous terms. Stuart, having won at Maida, chose to attack French garrisons in Calabria rather than relieve Gaeta, missing that opportunity. The fall of Gaeta completed French domination of the Kingdom of Naples, consolidating Joseph Bonaparte's rule over the territory.
Belligerents & Mobilization Analysis
Side A
1 belligerent
André Masséna.
Side B
1 belligerent
Louis of Hesse-Philippsthal.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.