First of all. Love your tutorial.
I learned the basics of the game from a friend. However the tips and tricks i have picked up on this thread has been very helpful in improving my game. Your insight into the game is impressive to say the least.
My friend told me the importance of ENG units due to river crossings and fortifications etc. To the point that i include ENG in every division that is motorized. However i feel that putting a slow unit like this along with my armor and motorized divisions slows them down too much. And secondly i feel that building so many ENG is a real drain on my IC.
What is your take on the use and importance of ENG?
They certainly have their uses, there's no denying that. But they also have downsides. On the plus, like your friend said, they are very good for crossing rivers and attacking fortifications. When properly teched up, they give a small bonus in urban and forest or jungle combat.
But they are not combat units. Their firepower is very low and, as a support brigade, their MP is low as well. And they require fuel.
Engineers are much better suited for exploitation than combat. Arm, Harm and Mot break through enemy lines. That's when the Larm comes out to shine. They can be very fast, reaching an enemy province before the enemy can retreat to it. If that enemy has no other way out, he's toast. Key is to make the Larm as fast as possible. It just needs to hold on long enough for the Arm and Mot to show up. There are two ways of doing that.
Larm/Mech/AC/AC: this baby is quite possibly the fastest thing on wheels in the entire game, coming in at 9.7 with 1936 AC tech and everything else at 1940 tech. This thing flies like the wind. River Attack -65%, fort attack -9%. Or you could substitute a Self-Propelled Rocket Artillery for one of the AC. You'd only lose 0.2 speed, and gain 5% Combined Arms bonus, but that would mean 2 extra techs to keep up-to-date.
Larm/Mech/AC/Eng: only comes in at a speed of 8, so it's quite a bit slower, but river attack is only -48%, while river defense is +25% and fort attack is +1%.
It depends on what you need them to do. If the goal is to hold behind a river until reinforcements arrive, the division with the Engineers will be better suited for the job. If the goal is to overrun the enemy and deny them an escape, then the first one does better.
I honestly hardly ever build any, because I prefer firepower over the small amount of extra speed gained under optimal conditions. The extra firepower is always good to have.
edited to add: Larm/Mech/AC/SpRart has -63.5% river attack and lower combat stats than regular Spart, but they are faster, which is what matters for exploit divisions.