[1] The forces of Edward (led by the English nobles Stephen Bauzan, Lord of Breigan and Llansannor and Nicholas FitzMartin, Lord of Cemais) invaded Wales with a large army of English, Gascon, and south Welsh troops in an attempt to restore Rhys and to halt Llywelyn's growing power.
The Welsh army harassed the encamped English constantly with a combination of arrows, spears, and intimidating sounds.
The English suffered some casualties, and since morale was low, Stephen Bauzan quickly sent Rhys Fychan (who had guided the army) to negotiate with Dinefwr castle's garrison.
The Welsh armies in the woods hit the English with devastating guerrilla attacks (using mostly bows or javelins) from the first hour of Saturday right up until midday.
Although there seem to have been few casualties, the engagement at Coed Llathen swung the balance in favour of the Welsh since the English had lost most of their provisions.
[6] Llywelyn ap Gruffudd, Prince of Gwynedd, is said to have been present at the battle, collecting spoils from the fallen English army.
This attack also proved unsuccessful when supply ships from Ireland failed to reach Henry and Edward's invading army.
Lacking food and supplies, the English army was forced to retreat, being constantly harassed by victorious Welsh guerrilla fighters on the way back.