Which is correct: I've (just) cancelled the trained/train armies?

Question

Which of these phrases is correct:

I've just cancelled the trained armies?

Or

I've cancelled the train armies?

I've just played Clash of Clans and one of my friends says he has cancelled the train or trained armies.

He had done his training armies but he just dumb them that's why he told me he had cancelled the "trained or train armies" These two words I'm confused whether the correct one is trained or train.

Answer 1

I would say

I've just cancelled the army training

The expression, trained armies, means armies that have been trained for combat, to cancel them, as the OP's friend seems to have said, would suggest that the player has deleted them. Train armies, makes sense only if it is part of a clause, as in:

1. We need to train the army
2. You can train the army faster if...
3. In order to train the army, you need...
4. Train armies, build fortresses...
   etc.

For the actual grammar, see @Jason Bassford's answer

Answer 2

Both versions of the sentence are fine.

You use just if you want to emphasize that something happened in the very recent passed as opposed to at some unspecified past time.

From Merriam-Webster's definition of the adverb:

1 b : very recently
// the bell just rang

In the right context, there is no reason to use just, as it will be assumed. If it was raining a minute ago, and has since stopped, anybody who knows it was raining a minute ago won't need to hear just to know that it's stopped in the past minute.

But even if the time frame is understood, and there is no need to use just, using it causes no problems. Some people will say it anyway.

If it's not known how long ago something happened, then using just makes it more obvious that it was recent.