Siege of Gloucester Castle 1139
Who Fought
History & Significance
The Anarchy was a civil war in England and Normandy between 1138 and 1153 which resulted in a widespread breakdown in law and order. The conflict was a war of succession precipitated by the accidental death of William Adelin—the only legitimate son of King Henry I—who drowned in the White Ship disaster of 1120. Henry then sought to leave the English throne to his daughter, Empress Matilda, but was only partially successful in convincing the nobility to support her. On Henry's death in 1135, his nephew Stephen of Blois seized the throne with the help of his brother Henry of Blois, bishop of Winchester. King Stephen's early reign saw fierce fighting with disloyal English barons, rebellious Welsh leaders, and Scottish invaders. Following a major rebellion in the southwest of England, Matilda invaded in 1139 with the help of her half-brother Robert of Gloucester.
In the initial years of civil war, neither side achieved a decisive advantage; Matilda came to control southwest England and much of the Thames Valley, while Stephen remained in control of the southeast. Barons who refused to support either side held much of the country. Castles were easily defended in this period, so the fighting was mostly attrition warfare: sieges, raiding and skirmishing. Armies mainly consisted of knights and infantry, many of them mercenaries. In 1141 Stephen was captured following the Battle of Lincoln, causing a collapse in his authority over most of the country. When Matilda attempted to be crowned queen, she was forced out of London by hostile crowds; shortly afterwards, Robert of Gloucester was captured by Stephen's wife, Matilda of Boulogne, at the rout of Winchester. The two sides agreed to exchange the captives Stephen and Robert. Stephen then almost captured Matilda in 1142 during the Siege of Oxford, but she escaped from Oxford Castle across the frozen Thames to safety.
The war continued for another 11 years. Matilda's husband, Geoffrey Plantagenet, Count of Anjou, conquered Normandy in her name in 1143, but in England, neither side could achieve victory. Rebel barons began to acquire ever greater power in Northern England and in East Anglia, with widespread devastation in the regions of major fighting. In 1148 Matilda returned to Normandy, leaving the campaigning in England to her eldest son, Henry FitzEmpress (future King Henry II of England). In 1152 Stephen attempted to have his eldest son, Eustace, recognised by the Catholic Church as the next king of England, but the Church refused. By the early 1150s, most barons and the Church were war-weary and favoured negotiating a long-term peace.
The ground they fought on
The site of Siege of Gloucester Castle 1139 lies on Lias Group, bedrock that formed in the Aalenian. The rock here is mudstone, siltstone, limestone and sandstone.
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- The Anarchy · Wikipedia
- Medieval Gloucester: Crown and Borough, Military History · British History Online (VCH Gloucestershire vol 4)
- The Siege of Worcester in 1139 · De Re Militari