During the march through Asia Minor, the rear of the christian army was protected by the Templars, who greatly signalized themselves on every occasion. Odo of Deuil or Diagolum, the chaplain of King Louis, and his constant attendant upon this expedition, informs us that the king loved to see the frugality and simplicity of the Templars, and to imitate it; he praised their union and disinterestedness, admired above all things the attention they paid to their accoutrements, and their care in husbanding and preserving their equipage and munitions of war: he proposed them as a model to the rest of the army, and in a council of war it was solemnly ordered that all the soldiers and officers should bind themselves in confraternity with the Templars, and should march under their orders.
The services rendered by the Templars are thus gratefully recorded in the following letter sent by Louis, the French king, to his minister and vicegerent, the famous Suger, abbot of St. Denis.
“Louis, by the grace of God king of France and Aquitaine, to his beloved and most faithful friend Suger, the very reverend Abbot of St. Denis, health and good wishes.
... I cannot imagine how we could have subsisted for even the smallest space of time in these parts, had it not been for their (the Templars’) support and assistance, which have never failed me from the first day I set foot in these lands up to the time of my despatching this letter—a succour ably afforded and generously persevered in. I therefore earnestly beseech you, that as these brothers of the Temple have hitherto been blessed with the love of God, so now they may be gladdened and sustained by our love and favour. ...
I have to inform you that they have lent me a considerable sum of money, which must be repaid to them quickly, that their house may not suffer, and that I may keep my word....” "
source "The History of the Knights Templars, Temple Church and The Temple", by Charles G. Addison Esq (London 1842)