Why do my parties lose troops?

Everytime I create an army my own parties lose troops. I've got millions so money isn't the issue. I don't put any limits on my parties they have unlimited wage.

No I haven't been in a town so they can't donate troops. Everytime I travel the map my son's troop count randomly drops. He went from 210 to 200 to now 195.

Is this part of the game a mechanism that prevents me from creating a massive army or just a bug?

submitted by /u/East_Newspaper5864
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