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I would argue that Howitzers have a major role to play with the ability to fire over hills and hit the reverse slopes. When its difficult to move artillery, range is also important.
Was thinking of a direct fire mode on this one. Bunker busting and taking out caves.
No argument there, a recoilless gun is quite effective at that sort of thing
Would hate to have to drag any artillery through a jungle. Brutal work.
To give you some idea of just how brutal, have a look at these
The best of the lot were:
Light artillery: 105mm LeFH 18/40 (Light, very accurate long range)
Medium heavy artillery: 150mm K-18 K-39 (Longest range highest destructive power)
Heavy artillery: 210mm K-38 173mm K-18 (Longest range highest destructive power)
Light Anti Tank gun: 75mm PaK40 L/46 (Probably the allround best AT gun of WW2)
Heavy Anti Tank gun: 88mm PaK43 L/71 (Most powerful accurate AT gun of WW2)