Webster's Revised Unabridged Dictionary
F., fr. OE. arban, heriban, fr. OHG. hariban, heriban, G. heerbann, the calling together of an army; OHG. heri, an army + ban, a public call or order. The French have misunderstood their old word, and have changed it into arrière-ban, though arrière, has no connection with its proper meaning. See Ban Abandon
Chambers's Twentieth Century Dictionary
O. Fr. ariereban, Old High Ger. hari, army, and ban, public proclamation.
In the 17th and 18th centuries the ban and arriere-ban were lacking in discipline when called out, and were last summoned in 1758.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2" by Various
The Suabian arrier-ban is up in arms; horses and riders, as many as have a sword and shield hanging on their walls, are ready.
"Ekkehard. Vol. I (of II)" by Joseph Victor Scheffel