Royal army approximately 12,000-14,000 soldiers under Henry IV and Prince Henry; rebel army approximately 10,000 troops led by Henry 'Hotspur' Percy, per Wikipedia
Percy Revolt 1403 was a medieval pitched battle between opposing field armies, fought at Shropshire, England in 1403. Henry IV (royal forces) prevailed over Henry 'Hotspur' Percy and rebel forces. Royal victory; Hotspur killed by an arrow, causing rebel collapse; the battle ended the Percy challenge to Henry IV and confirmed the House of Lancaster on the throne.
The site of Percy Revolt 1403 lies on Permian Rocks (Undifferentiated), bedrock that formed in the Permian. The rock here is sandstone and conglomerate, interbedded.
This page covers Percy Revolt 1403. A full Aubrey report for the area pulls together this battle alongside scheduled monuments and everything else the record holds within a few miles:
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