That's pretty bad advice overall, if you ask me...
- They are quite cheap yes, but not that cheap. In particular, they cost as much same manpower as infantry, which players don't have enough at the beginning (when militia are precious). On the other hand, early on players should have enough food and supplies.
Their strength is not so much in their price, but how fast they are to produce - almost 3 times faster than infantry. They are the units of which the ratio HP/time to produce is the highest, by far, and they are therefore very useful to buff up a stack in defense...
- β¦ which brings me to topic #2. Militias level 1 are very useful, as they have 15 HP just like militias level 4. On the other hand, researching militia level 4 cost Raw Material and research slots, so it should not be your prio once you have militia level 1. Your level 4 militia has cost 10K raw materials to research, your level 3 infantry has cost 3K. In addition, your level 3 infantry moves significantly faster, something useful also in defense, and is (marginally) better vs tanks.
- Yes, militia are really good in defense in hills/forests,... against infantry. Their +75% bonus does not save them against tanks. In addition, they are as slow there as in plains - 15km/h, whereas level 4 Arty or AA or AT goes at 25 km/h, which means they are so slow that they can get kitted by artillery in territory they own...
β¦ provided your opponent even care and does not just attack through another axis.
It also means that they perform better against armors in city (due to -50% attack / -50% HP of tanks there) than they do against infantry in hills, and usually cities are more valuable than hills, too.
Even the "don't" are not that great. True, they don't replace infantry, but once they have done their role in defense you should totally send them overseas β¦ to die, since their maintenance cost is significant (20% of their price in food, which is the rare resource by end game) so no need to keep them around.
There should not be militias built in barracks without IC (since without IC you lose what makes Militia fantastic : speed of production), though of course don't keep active barracks you don't use.
β¦ which brings me to what militia is useful for, which in my opinion is one thing => Give HP quickly to your stacks for a small price, either preventively or during a battle.
The most common example and the one I almost always use militia for is early game. In the first days you don't know whether you are going to be attacked by those neighbours you don't know and, when you are getting attacked, churning HP at a pace that can actually change the result of the battle (compared to producing infantry that may arrive too late).
So in practice, there is always a city too close to the borders, or really strategic for one reason and another, and really you don't want to overcommit in defense because well you want to expand, too. What you do is instead of detaching let's say 4 infantry in defense (because anything smaller than that will just get destroyed by a 10 infantry stack early game), you detach 2 infantry in defense, and add 3 militias (which is the same time more or less as one infantry, so you are 1 infantry positive). If you are attack, your opponent has 75 HP to go through, which usually will take him 3 - 4 hours + the march time to reach your city, which allows you to produce 1-2 more militias (15/30 more HP), holding that much extra time which should allow you to bring back your attacking army.
The exact balancing you are comfortable with may change, but that's the most common role of militia. Other roles I have used them for or seen them used for
- Bring HP to a naval stack, since they don't go slower than other convoy,
- Bring HP to an airport to prevent (or make more expensive) rocket attacks disabling an aiport,
- Escort artillery, though it makes for a very slow stack (arty is 20km/h, and then 25km/h at level 4), for these reasons I mostly see that early game.
Ah, and big "don't" : don't stack militia with anything in attack (only exception might be artillery stack), they slow down significantly anything that you attack to them. I can't count the number of times where I have seen players attaching militias to Light Tanks⦠Seriously.