so try setting a move waypoint at the start of the bridge which tells them to form a column or a staggered column, then put another one at the other end of the bridge..
If you place a wayopint at the start of the bridge, and
you set the behaviour of the group/unit in this waypoint,
this will cause the group/unit to use the behaviour, you've
been setting in this waypoint. That's ok, but i think this
won't be the result, you want to get here, because the
behaviour settings of a wayopint will be executed, before
a unit/group has reached the waypoint.
e.g:
waypoint1: behaviour: safe
waypoint2: behaviour: careless
waypoint3: behaviour: combat
Now as long as the unit/group is moving to waypoint1, it
will be in "safe" mode. Once it has reached wp1, it will use
the settings of the next waypoint (careless in this case).
At the location of wp2, it will then turn to combat mode,
because that's the setting of the next waypoint.
So in the case of crossing the bridge, you might need to
set the behaviour to careless, or whatever you want, for
the waypoint after the one at the start of the bridge.
~S~ CD