The Fereldan army was cobbled together from commoners and banns who had turned against the Orlesian usurper, King Meghren. Even so, under the leadership of Loghain Mac Tir, they scored an astounding victory against a large force of chevaliers fording the River Dane.Afterwards, Loghain was hailed as a Fereldan legend, and for a time veterans of the battle enjoyed similar status. The soldiers' possessions became prized mementos, in particular the suits of armor belonging to those early supporters who joined Maric after the death of his mother, Moira, the Rebel Queen. Folk tales suggest that the Maker's blessing lives on in the armor those brave allies wore on that fateful day.
—From Codex entry: Arms of the River Dane
This is the same concept art for the Arms of Mac Tir.