How do I stop this from happening?

[PoorOldSpike]

'HIDE' WITH 15m ARC TO STOP YOUR MEN FIRING AT TANKS
In this series of tests, a T-34 trundles on 'Move' from top of map.

1- No arc, no hide. The infantry try to blow away the tank commander when he gets to 37m range.




2- 30 metres arcs, no Hide. This time the arcs make the inf hold their fire until the tank enters the arc at 29m.




3 - 30m arcs, Hide. The Hide has no effect, the infantry un-hides and opens up when tank enters arc. Obviously his desire to defend himself overuled his order to stay on Hide.




4 - 15m arcs, no Hide. The inf hold their fire but are spotted by the tank which begins turning its turret to fire.




5 - 15m arcs, Hide. At last the infantry hold their fire and the tank trundles by without them shooting at it, and without it spotting them.


Conclusion- To force your inf to hold their fire you must slap a 15m arc AND a Hide order on them, otherwise they'll fire to defend themselves when the tank gets to within about 30m, because at that range they know the tank will possibly spot them anyway, as pic 4 showed.
(For the record, in some tests the TC became a casualty, in others he was unharmed)