AI "reaction" question

[Skirmisher]

Hi Everybody,
I was thinking it might be a better idea to just use reinforcements more,especially when you want something to hold for a long time.

I had some problems with the reaction button to,I had sappers set to react near end of game so they could surprize the enemy as they attempted to take the victory hexes,yet they were on the move shortly after the game started. So in that case if I had just made them reinforcements at the proper time they would have been were they were supposed to be.