uhh i think it has something to do with how many "fast" units in your reinforcing army. Like if it contains a lot of cavalry, then the reinforcements will get there asap. I think if you compare the enemy army to your reinforcement army, you will know if the reinforcements will arrive. I know generals make sure your whole army arrive together, while armies without one tend to arrive seperately.
Also, you can get more than a full army stack into battle just by letting the ai control your reinforcements. I think some of you had your reinforcements delayed because you were already at your limit(the number of men you can control). Just make sure that ai controlled box is checked before you go into battle and you'll see surprisingly LARGE uneven battles.
I found this out when I kept seeing how the ai sent in reinforcements even though they were over their limit. I thought they would have to wait before the other large army came in, but I was surprised to see like 5000 units against my 2500 units. If you want your reinforcements to come in, let the ai control it.
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