This is probably being a bit pedantic, but I'm aware in the rules of how often a single word can be significant. In this case the single significant word is "immediately".
In the rules for
Scouting on page 15, it says in part:
If any scouting element scores 4, the furthest forward only of any enemy ambushing elements must immediately be placed. If any scouting element scores 5 or 6, all enemy elements used in Ambush...stratagems must be placed...
Note that the word "immediately" is only used when scouts roll a 4, but not a 5 or 6. In other words, the rule suggests to me that if your scouts roll a 5 or 6 the enemy ambushing elements must be placed, but not immediately, which in turn suggests they get placed with the rest of the army.
I'm sure this is wrong. That is, I'm sure the whole ambush should be placed
immediately but I just wish the rules said so.