My strategy was simple:I don't know why you'd give your opinion on a subject you don't understand. I went through the trouble of making the exact same division the OP did in-game just to get this screenshot
pure tank division, exact same template, 18.3 org
What OP did is completely viable vs the game's AI. Just run around the enemy troops and capitulate them. Mobile warfare is a strong doctrine when properly used, it's a... mobile doctrine after all. You can use mobile warfare even as smaller countries, I had my Tannu Tuva achievement run done with it, even though I had 0 tanks. They are very good for taking land behind enemy lines quickly, you lose less org and move quicker.
EDIT: Actually OP said he used superior firepower. Interesting choice. The org must've come from the support companies, then. I wonder if he'd be able to capitulate Germany even quicker if he had taken mobile warfare for the extra speed and less org usage when taking land, for the cost of less soft attack.
Also another option, is to build hundreds of 2 width light tank divisions with the most speed you can get. You can then take land like crazy. I saw someone with tanks of almost 50km/h speed when taking jet engines.
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To minimize the production of equipment for the infantry division, I didn't give any resources to the infantry division, they didn't do any combat tasks, I just put all the industry into the armored division,
Instead of using motorized infantry battalions to increase organization and HP for extreme speed requirements,
In order to pack as much firepower as possible into the smallest possible width, I chose tank Battalion (2 width)
At first I was worried that the division would crash with an AI counterattack (low HP).
In reality, the AI is mostly made up of 9 infantry battalions and 3 artillery battalions, which are not fast enough or powerful enough to pose a threat
Buffs such as commander buffs, battle plan buffs, etc. actually have +200-+400% combat efficiency for the first few days
This means that with 2000+ soft attacks, AI infantry divisions are completely unable to withstand such fire,
With a soft attack of around 400, AI infantry divisions can withstand even a few days as they have time to reinforce and rotate
But with 2000+ soft attacks, those reserves fled together without reinforcements
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