This has happened quite a few times now and I don't know why. On the battle start screen it always shows the enemy main army attacking and sometimes reinforcements he is bringing too. But other times reinforcements keep joining the actual battle but they were not shown on the start screen. Even the unit counter in the bottom center can go to 0(0) for the enemy units yet there are multiple still in the battle. Why is it doing this?

I believe there are two reasons:



1) Units with stealth don't usually appear as reinforcements.



2) There's an issue with some quests (Second Mouse) where an out-of-sight quest mob won't show up as reinforcements, but will enter the battle.