Entrenchment

[maxfra]

The entrenchment stat is a value for the whole unit and not for the single SFType (as it is for ex. readiness or experience).
So, if I want to use a unit as a garrison in a urban environment (where the auto entr. value is 100 for inf) is it the same using one of the following?
1) Only infantry types
2) infantry + tanks or trucks for giving mobility.

In the last case inf has an autoentr. value of 100 and tanks have a value of 0. The whole unit has an entrench value somewhere between 0 and 100.
If I mix them does the inf suffer from an entrench penalty compared to 1) where the inf is alone?

So if I have both tanks and Inf is it better to use them in 2 different units or it is the same to let them be in the same unit?

[xBoroNx]

I can't answer the entrench question, was too lazy so far to read the manual deeply and do some testing.
But your other question i can answer i think.
First and most important, tanks have good attack values but bad defense values. A medium tank e.g. has 1800 attack points vs. armor but only 1200 defense points. Vs. infantry it is even worse, 750 attack, 370 defense. So tanks are very vulnerable to counterattacks. Riflemen have the same attack and defense values, expect vs. other infantry, there they have only 13 attack but 26 defend.
So if you can afford it Tanks + Mot Inf would be excellent. I would try to build such forces: 4 tanks + 20 Inf = 60 Stack points. They are for the offensive. Optionally you can mix in a few mortars. The infantry tend to soak up some damage and thus your tanks live longer.
And then mot inf to defend the tanks, there something like that would be good imho: 40 Inf + 2 At Guns + 2 Flak + 4 Trucks. They have the same speed as the tanks. Use them not for conquest, but to protect your tanks from enemy counterattacks.

If you are the defender, it is easier, this way you can simply use lots of infantry, not mobilized. Then you can do local counterstrikes with your Tanks or the infantry if the enemy has isolated Tanks. Air superiority is also key because tanks and trucks are so vulnerable to Bombers. So if your enemy has Air superiority and lots of Artillery he can methodically destroy your forces hex after hex. This is a very slow process, but imho often effective, at least as long as speed is not key.

[Peterk1]

I tend to use tanks in units by themselves. Makes things easier to keep track of and I'm positive that their speed isn't being hampered by other units.
I try to keep them safe and sound and out of the way when defending.
When attacking: to break through a line I use them in combination with infantry only units; when I have a breakthrough already I use them more independently.

[freeboy]

remember tanks carry five inf at no loss of mobility

[Peterk1]

Thanks for the tip.
Reminds me to actually read what the units do instead of relying on what I think they do.

Ah but now that I think twice about it, you might still get screwed...you get in a battle and lose a tank, but no infantry. Then your speed is affected and you might easily miss it if you're not paying attention.

[xBoroNx]

Usually the attached infantry dies much faster than the tanks. So in 9 of 10 cases i have to replace the infantry losses, only in 1 of 10 the tank losses .

[IRONCROM]

 I don't put a lot of infantry with my armor either. When I do it's usually rear area types like Mortar.
The reason I do that is cause the infantry are always dying in droves and keeping my experience from getting very high.
Just my personal preference.