<font color="beige"><b>I think it's more a matter of terrain movement costs rather than modifying the tree height. The visibility occurs because the summit hexes are 2 steps up (60 feet) from some of the surrounding hexes thus negating the 50 foot tree height.
The union used the top of big round top as a signal station early in the battle, which means there was LOS from the summit, the same LOS situation occurs on the summit of Culp's Hill.
Raising the tree height to over 60 feet will give no visibility from the summit even though this is the highest point on the battle field (not counting the mountains to the west) and would also blind Culp's Hill's view to the north east.
The issue is Big Roundtop was a steep sided wooded hill laced with large boulders....ground that infantry could slowly move through but pretty much impossible for an artillery piece.
Having the ability to "stack" rough and forest terrain in the same hex or creating a rough/forest terrain hex modifier would negate the movement of artillery and mounted cavalry to the summit while allowing infantry and dismounted cavalry.
I can't agree with the argument against LOS to a target on such high ground, trees do give some visual cover and the target modifiers, 40% for forest and 20% for elevation account for that. I've always thought that artillery and small arms need different cover modifiers, a wood fence gives some cover to small arms (10%), it should give none to artillery fire. It seems like melee and fire modifiers should be different for different types of cover too.....but that's another story.
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<center><font color="blue"><b>Maj.Gen. R.A.Weir</b></font id="blue">
<font color="yellow">THE CALVERT LINE</font id="yellow">
<b>First--III--AoA CSA</b></center>