A useful source for arms, armour and costume of the 15th century, selected illustrations of military interest from:
Pageant of the Birth, Life and Death of Richard Beauchamp, Earl of Warwick attributed to John Rous, c. 1485-90. British Library MS. Cotton Julius E IV
How Earl Richard kept jousts at Queen Joan's coronation.
How the blazing star called Stella comata appeared, and the beginning of the war in Wales.
How Earl Richard behaved himself at the Battle of Shrewsbury.
How Earl Richard was made Knight of the Garter.
How Earl Richard fought with and wounded Sir Pandolf Malateste at Verona.
How Earl Richard was received by the Patriarch's deputy at Jerusalem.
How Earl Richard gat him great worship at a tourney on his way home.
How Earl Richard was made Captain of Calais.
. An English Liveried Retainer in Armies of the Middle Ages, Volume 1 by Ian Heath, based on John Rous’ Pageant of the Birth, Life and Death of Richard Beauchamp, Earl of Warwick
How Earl Richard jousted with Sir Gerard Herbaumes, called the Cheveler Ruge.
How Earl Richard jousted with the Blank Knight, Sir Hugh Lawney.
How Earl Richard jousted with Sir Colard Fynes.
How Earl Richard jousted with a mighty Duke before the Emperor and Empress.
How Earl Richard won two carracks in a sea fight.
How Earl Richard besieged the town of Caen.
How Earl Richard was at the Siege of Rouen.
How the Dauphin of France waylaid Earl Richard and his men.
How the Duke of Burgundy was driven from before Calais.

mirror site:
Pageant of the Birth, Life and Death of Richard Beauchamp, Earl of Warwick attributed to John Rous, c. 1485-90. British Library MS. Cotton Julius E IV

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15th Century Illustrations of Costume & Soldiers