Or if you want to use waypoints instead of scripts:
:note - in the example below i'm asuming that you're
using a group of 11 soldiers grouped to a truck and in
the special field of the soldiers: IN CARGO
If you want to have the group seperated from the truck,
the waypoints will be a little bit different, but in general
the 2 HOLD waypoints (wp1 and wp4) + the syncronizing would still remain the same way.
Also the example is built for WEST attacks one of the base
and EAST sends a truck with reinforcements.
You need to create 2 detection triggers as LCD already
mentioned:
triggerA: covers base1
activation: west detected by east
type: switch
condition: this
triggerB: covers base1
other settings make the same as for triggerA
Now you need your truck and it's waypoints
waypoint1:
type: HOLD
syncronize this waypoint with triggerA (F5 + drag a line)
waypoint2:
type: GETOUT
somewhere near base1 or in base1 (up to you)
waypoint3:
type: GUARD or HOLD where you want them to reinforce
waypoint4:
type: HOLD
syncronize this waypoint with triggerB
waypoint5:
type: GETOUT
somewhere near base2 or in base2 (up to you)
waypoint6:
type: GUARD or HOLD where you want them to reinforce
~S~ CD