I've just finished painting a last few figures for my Insubres army for Hail Caesar and, while it looks magnificent on the table, it has been one of my least successful armies.
On their own, it has won exactly one battle and that was heavily stacked in its favour. NB as part of a Carthaginian army, a better record but then, the Carthos did the heavy lifting.
The army has:
five medium warbands
an elite Soldurii unit
three cavalry and one light cavalry units
three lots of skirmishers
two chariot units
On paper it seems dangerous. In practice it usually charges enthusiastically, inflicts some early damage, then gradually loses momentum as the battle develops: ending in a heap.
I'm interested in advice from players of any ancient rules, not just Hail Caesar.
How do you get the best from Celtic armies?
Do you:
attack immediately?
refuse a flank?
concentrate everything on one wing?
use terrain aggressively?
hold warbands back until the right moment?
rely on attrition rather than shock?
What have you found actually works?