http://www.goarch.org/chapel/saints_view?contentid=257
The world has found in you a great champion in time of peril, as you emerged the victor in routing the barbarians. For as you brought to naught the boasts of Lyaios, imparting courage to Nestor in the stadium, in like manner, holy one, great Martyr Dimitrios, invoke Christ God for us, that He may grant us His great mercy.
God, who gave you invincible power and with care kept your city invulnerable, royally clothed the Church in purple with the streams of your blood, for you are her strength, O Dimitrios.
http://onlinechapel.goarch.org/images/small/demetrio.jpg