Perhaps because it was made as a two-parter (that translates to over 90 minutes of movie), this plays as a long slog. While that is obviously appropriate to a story of war, even used by Rumsfeld in describing war, that doesn't translate to solid or entertaining dramatics. If a screenwriter is to come up with a story in which the entire "Combat" cast is captured, it's like writing yourself into a corner on purpose.
In this case, unlike the model "Stalag 17", the show is humorless (and colorless), as Vic in captivity plans to escape, while the longer-in-captivity prisoners led by Simon Oakland, have given up and oppose anyone attempting to escape, fearing reprisal from ruthless Richard. The SS officer seems to hold all the cards, but Vic and his men have got to try, no matter what the odds. The cliffhanger ending has Basehart smugly winning the first round in grim fashion.