Slitherine

I play on general level 1939 campaign. In poland scenario i had Panzer III i bought and he survived. Next scenario, Norway, I dont have im anymore. I won decisive victory in Poland, i hope thats not the reason they removed my unit. Any help?

It wasn't a core unit but only an auxiliary unit.
The auxiliary units will never traveled with you throughout the campaign. Only the core.
The auxiliary ones have a silver border while the core have a golden border.