You will need army experience to costumize your divisions. Keep the infantry division that has as much battalions as possible, if you don't know what a battalion is you'll find out in the Division Designer section. To quickly do this, select your whole army then hold SHIFT and click on the unit you don't want to disband. Once you are left with only one division, assign it to a general and start training it.

If you play with nations that have colonies such as France or UK check for troops in colonies too. As soon as the game starts, select your whole army and delete everything except for one infantry division. Unless you're playing Germany, Italy or Spain. Reduce your army to one division and then train it to farm army experience. The AI plays poorly and doesn't do most of the things I will mention below, giving you a huge advantage over him. That being said, let's learn how to beat the singelplayer. The game is easy to learn and hard to master, once you get to know how divisions work in-depth, how supply lines work, and how air and sea combat works as well, you will discover a whole new game that's especially fun in multiplayer. Since you've finished the tutorial you already know how to move and produce units and how factories work, but the game has a lot more mechanics than that, I will not even scratch the surface here, I will only teach you what you need to know for an easy singleplayer victory. Although it can be successfully played by massing infantry, at least in singleplayer, a few tricks will make your singleplayer experience easier and also teach you some basics of the game. Unlike other Paradox games where the larger army usually means victory, Hearts of Iron IV is much more complex. This guide assumes you have finished the in-game tutorial with Italy. Each section has both specific advice as well as general advice.

If you learn to win with those nations you can win with almost any other nation.

You just started playing and keep losing in singleplayer ? This guide will teach you how to easily win with the following nations: Germany, France, Romania, China, Brasil, Italy, Spain.

Hearts of iron 3 walkthrough