[Rules] Engineers vs. Caves

[Schoenwulf]

Started playing Guadalcanal scenarios. One of the historical aberrations my opponent and I ran into was that there is no modifier when using engineers against caves. We checked the 4th edition rules, Guadalcanal and Saipan special rules. Was this an oversight? We are leaning in the direction of "yes".

Thought the same when I played this scenario recently; both the engineers and the mortar units don't really contribute much.