I tried on Mac, v 1.8.0 and it works fine. It's true that briefings says that is a 20 turn mission and there are no counter, so you don't know how many turn still left. I've run through over 20 turns without further computer action. I don't know if this is a problem unique to the PC version, or whe...

I am having the same issue.

I destroyed the first wave, then nothing. I noticed a turn or two after no German had appeared that there was no turn counter. I sent a truck on a recon to the South, and confirmed that there are German units there. I've gone through twelve or fifteen turns.