[ASLML] ?? Multiple Advance into CC??

[EK I]

hello List,

can't find a reference to multiple advances requiring Ambush dr's into CC in
the same hex .  if infantry advance into CC in a building hex containing an
enemy squad from more than one ADJACENT hex, is a separate Ambush DR made
for each advance, or a single roll for all.  if separate rolls are made for
each individual advance, and the first advance results in no Ambush but the
second or third does, does that Ambush DRM apply to all susbsequent CC
attacks, or just those made between the individual squads involved when
Ambush actually occurred?

many thanks - gt