Help needed: Mainstein's Big Guns Last Mission

[Larstron]

Its the one where you need to wipe out all the troops in a Naval base, capture/destroy all the gun boats at the docks, capture the Italian CB submarine, and also defeat the Romanian armored convoy.

I've done all that, but the game won't end.

Wiped out every red dot on the screen, destroyed all the boats, captured the CB submarine. And Lt Federov is still alive.

only the second convoy is announced but did not apear

can someone help me ??? Thanks