Fleeing from a flank march arriving on a base table edge

[LawrenceG]

"Arrival Surprise
Any enemy element less than 400p from and in sight of the place of arrival on a flank edge of any non-straggler element of an unopposed or larger land flank march must immediately flee as directly as terrain permits away from that flank edge..."

At BRITCON my opponent brought his flank march on my rear edge, as it had 6 PIPs. According to the above, my troops did not have to flee. This surprised us and left one of my elements in a position that proved critical, enabling me to break the flank marching command  a couple of bounds later.  In other situations I can see the possibility of flank marchers tactically moving into the rear of enemy near the base edge. Should it be changed in 1.1?

[andrew]

This seems to have been a purposeful omission (?) from the rules.  Would you be informed of enemy reinforcements arriving to your rear?  I'm guessing that you would (by various friends fleeing from the advancing enemy) so as such it wouldn't be surprising.......just a thought.  Notice also there is no arrival surprise for a flank march arriving by impressed shipping - again I suspect there is no surprise given you could see them coming.

[MikeCampbell]

Yep - knew these cases & have played them like that....although I forget other bits in the rules on a rotational basis!