Say I have a loose formed tribal TuG of Javalin armed foot, if charged by nasty legionaries can they choose to run away / skirmish.

The run away or skirmish chart states , "Skirmishers, Cv,Cm or Ch with skilled , experienced, or unskilled shooters.......  (no mention of foot TuGs)

Section "J" page 126 doesn't really state foot TuGs at all 1.2 say TuGs containing any charging lancers, battle Wagons, elephants, devastating chargers, or any fully-armoured or armoured horse never run away in any circumstance.

I presume that foot TuGs containing  missile troops have to stand and fight

Think its the expendable attack dice so therefore would apply to damage done to the enemy, I guess since their limited life span is short they cause chaos for a short period.

Pretty sure most of my best units seem to have the expendable characteristic without it being recorded....

If the gap between  the edge of the board and allied tug is less than two files width does that cause a KaB test?

<
EDGE     
OF        
BOARD 
           TUG TUG TUG
           TUG TUG TUG
           TUG TUG TUG
SUG SUGTUG TUG TUG
SUG SUGTUG TUG TUG
SUG SUGTUG TUG TUG

       TUG TUG TUG TUG
       TUG TUG TUG TUG
<
EDGE     
OF        
BOARD

Sorry I'm not good at explaining, two Tugs are in combat, Sug is wedged on flank between edge of board shooting at my back rank of file.
I brought up another TUG to block its exit and then played cards to expand on my left side hoping that I could force it to move away.
If it had to move away it either has to go off the board to its left or infiltrate back through its own TUG as there isn't enough room to get past its own TUG that was in combat.
If the Sug "evades"? I have no idea if it disappears or causes damage as it excapes

Say I am facing off against a another tug but have a sug on my flank, can I expand my files (as in to get an overlap on the tug files) through the skirmish sug and push it away,

Regards Elise