I seriously hope that the upcoming grand expansion Barbarossa will overhaul many things in HoI4. Let's discuss the map and logistics here.
I'll start with an example of the Fall Blau region from Rostov to Maikop and the lower Volga.
I recommend TIK's Battlestorm Stalingrad series on YouTube as a reference:
https://www.youtube.com/playlist?list=PLNSNgGzaledi9jQeOzCUtBP2pxYdCYiXX
This is how "Warplan" (Slitherine) models the region:
- Stalingrad-Astrakhan: Lots of swamps on the eastern bank of the Volga. You can tell at one glance why Germany wanted to take Stalingrad and Astrakhan (railway junctions and the latter also being a port for the Caucasus oil.
- In WW1 Ludendorf declared the end of the railroad for troop logistics and announced the age of trucks for flexibility. However, that might work in France, but not in Russia with severe fuel shortages and the Rasputitsa. In 1942 Germany's oil situation was so dire that Fall Blau relied almost solely on railroad transports and supplies instead of trucks. That however lead to a "railroaded" (pardon the pun) conduct of the campaign. Which leads to the next point:
- Railroads from Rostov to Stalingrad and from Rostov to Maikop: That is a possible explanation why Hitler split the Heeresgruppe and sent one half prematurely into the Caucasus. The railway capacity was already strained be half of the army group, so the split at least made logistical sense.
- A two-track railway line can transport the same amount of supplies as the equivalent of 1,600 trucks. Tradeoff: less fuel consumption for less operational flexibility
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HoI 4: The Stalingrad-Astrakhan region.
- All plain territory, no swamps. Zero logistical puzzle due to lack of realistic terrain and complete absence of railroads.
- In vanilla you can simply rush from Rostov to Turkmenistan with neither Stalingrad nor Astrakhan playing a role.
- Logistics hardly exist and can be easily solved by repairing infra and constructing more while blitzing ahead. Even tough mods like "Total War" (which are brutal on logistics) can stop a player from annexing the Soviet a.i. in 1-2 years.
- Rivers don't feel like sizeable obstacles, partly because of missing railroads.
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Google Maps: here you can see how accurate Warplan got the region.
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