The wars began not long after the loss of the Shield of Achille, as Daventry no longer had any magical defense to prevent Daventry from losing. Following the loss of the Gold Chest they could no longer pay their armies and mercenaries to stop invading forces.
By the end of the wars Daventry was left with only 100 knights and soldiers defending the kingdom, and the magical spells of wizards placed on the castle to defend it.
Graham was forced to defend from the invaders from outside countries, and even his father Hereward another of Daventry's greatest knights died during one of the border wars. Perhaps the knight, James of Daventry died during one of these wars (though he may have died long before Edward's time as well, it is unknown).
The invading forces continued to steal land, and shrink the size of the kingdom, encroaching ever closer on the lands near Castle Daventry.
Potential nations that may have been at war with daventry may include Cumberford and Lycathia. The Swamp is also a small kingdom along the northern to north-eastern border of the kingdom, but its unclear if it would have taken part in the border wars as well, as mostly non-humans live there (though its possible monsters invaded from there). Another possible close nation is Herenna, from there a great dragon once threatened Daventry.