Wikipedia states the rebel force numbered around 30,000 men under Sir Robert Welles; the size of Edward IV's royal army is not clearly recorded in the sources reviewed.
Battle of Losecoat Field (Empingham) was a medieval pitched battle between opposing field armies, fought at Lincolnshire, England in 1470. King Edward IV / Yorkists prevailed over Lincolnshire rebels led by Sir Robert Welles. The rebel army broke and fled before serious fighting developed, reportedly discarding their livery coats as they ran (giving the battle its name). Sir Robert Welles and Richard Warren were captured and later executed at Doncaster on 19 March 1470; their confessions implicated Richard Neville, Earl of Warwick, and George, Duke of Clarence, forcing both to flee England.
The site of Battle of Losecoat Field (Empingham) lies on Kellaways Formation And Oxford Clay Formation (Undifferentiated), bedrock that formed in the Oxfordian. The rock here is mudstone, siltstone and sandstone.
This page covers Battle of Losecoat Field (Empingham). 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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