On 19 Dec 1387 the forces of the Lords Appellant led by the future King Henry IV of England (age 20) prevented the forces of King Richard II of England (age 20) commanded by Robert de Vere 1st Duke Ireland (age 25) from crossing the bridge [Map] over the River Thames at Radcot in Oxfordshire. When Thomas of Woodstock 1st Duke of Gloucester (age 32) arrived with further Lord Appellant forces the King's men were encircled. The King's men attempted to force the crossing of the bridge at which time the only casualties occurred including Thomas Molyneux (age 49) who was killed by Thomas Mortimer (age 37). Robert de Vere 1st Duke Ireland (age 25) narrowly escaped to France. Around 800 of his men drowned in the marshes whilst trying to escape.