Rymer's Foedera is rich in diplomatic and other documents for this period, and from this time we have a storehouse of political and social information in the Parliamentary Rolls.
For the French war itself our primary authority is the Chronicle of Jehan le Bel, a canon of the church of St.Lambert of Liege, who himself served in Edward's campaign against the Scots and spent the rest of his life at the court of John of Hainault.

Up to the Treaty of Bretigny, where it closes, Froissart has done little more than copy this work, making however large additions from his own enquiries, especially in the Flemish and Breton campaigns and in the account of Crecy.

Froissart was himself a Hainaulter of Valenciennes; he held a post in Queen Philippa's household from 1361 to 1369, and under this influence produced in 1373 the first edition of his well-known Chronicle.

A later edition is far less English in tone, and a third version, begun by him in his old age after long absence from England, is distinctly French in its sympathies.

Froissart's vivacity and picturesqueness blind us to the inaccuracy of his details; as an historical authority he is of little value.