Given the loose organization of medieval armies, orders of battel in the modern sense are not possible to compile. It can be assumed, however, that each of the leaders listed here for each battle led a substantial part of their respective armies.
Pilleth
Welsh
Owain Glyn Dwr?
Rhys Gethin
English
Sir Edmund Mortimer
Sir Walter Devereux
Sir Thomas Clanvowe
Sir Robert Whitney
Sir Kinnard de la Bere
Homildon Hill
English
Henry, Earl of Northumberland
George Dunbar, Earl of March
Sir Henry Percy (Hotspur)
Scottish
Archibald, Earl of Douglas
Earl of Moray
Earl of Fife
Earl of Orkney
Earl of Angus
Sir John Swinton
Shrewsbury
Royalist
King Henry IV (main battle)
George Dunbar, Earl of March (main battle)
Prince Henry (rear battle)
Duke of York (vaward)
Earl of Stafford (possibly vaward)
Rebel
Sir Henry Percy (Hotspur)
Thomas Percy, Earl of Worcester
Archibald, Earl of Douglas
Sir Richard Vernon
Sir Richard Venables