See BOSSISM.
HEERBAN, The.
The "heerban" was a military system instituted by Charlemagne,
which gave way to the feudal system under his successors. "The
basis of the heerban system was the duty of every fighting man
to answer directly the call of the king to arms. The freeman,
not only of the Franks, but of all the subject peoples, owed
military service to the king alone. This duty is insisted upon
in the laws of Charlemagne with constant repetition. The
summons (heerban) was issued at the spring meeting, and sent
out by the counts or missi. The soldier was obliged to present
himself at the given time, fully armed and equipped with all
provision for the campaign, except fire, water, and fodder for
the horses."
_E. Emerton,
Introduction to the Study of the Middle Ages,
chapter 14._