Siege of Oxford Castle 1142 was a medieval siege, the investment of a fortified position, fought at Oxfordshire, England in 1142. King Stephen prevailed over Empress Matilda. Oxford Castle surrendered to King Stephen the day after Matilda escaped in early December 1142; she fled the castle (likely via St George's Tower) dressed in white as camouflage against the snow, crossed the frozen River Thames with three knights, and reached Abingdon Abbey and then Wallingford Castle in safety.
The site of Siege of Oxford Castle 1142 lies on Kellaways Formation And Oxford Clay Formation (Undifferentiated), bedrock that formed in the Oxfordian. The rock here is mudstone, siltstone and sandstone.
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