Key Facts
- Dates
- July 1309 – January 1310
- Duration
- Approximately 6 months
- Result
- Castilian defeat; siege lifted
- Attacker
- Kingdom of Castile
- Defender
- Emirate of Granada
Strategic Narrative Overview
Castilian forces surrounded Algeciras beginning in July 1309, but the siege dragged on without decisive progress. Conditions in the Castilian camp deteriorated severely, undermining the morale and cohesion of the besieging army. A critical blow came when Infante John of Castile, a powerful vassal, deserted the campaign, depriving Ferdinand IV of essential military and political support needed to sustain the prolonged operation.
01 / The Origins
During the Reconquista, the Kingdom of Castile sought to extend Christian control over southern Iberia by capturing Algeciras, a strategically important port held by the Emirate of Granada. King Ferdinand IV of Castile led the effort, mustering royal forces and vassals to besiege the city. Control of Algeciras would have given Castile a key foothold on the Strait of Gibraltar, threatening Granadan and North African links.
03 / The Outcome
By January 1310, facing wretched camp conditions and the loss of key allies, Ferdinand IV was compelled to abandon the siege entirely. The withdrawal represented a humiliating failure for Castile and left Algeciras in Granadan hands. The city would remain a contested objective for Christian forces in subsequent decades, reflecting its enduring strategic importance on the southern Iberian coastline.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Ferdinand IV of Castile, Infante John of Castile.
Side B
1 belligerent
Abu'l-Juyush Nasr.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.