I noticed on the assault chart (version/edition 4), that assaulting a "Dug in" unit(s) doesn't have any negative aspects. Whereas on the Terrain Effects Chart it does. I have assumed that the -1 adjustment is in effect for that situation, as it makes sense AND makes for consistency in the rule charts. It makes sense.
Hmmm. So the terrain effects chart is wrong, yes? I can see where the idea of a dugout vs entrenchments would be viable..... It certainly makes "breaking a line" easier, however. We'll keep an eye on the situation and report my findings to the forum.