The original TV series was, in my opinion, one of the finest war film series ever produced - I can't think of another that had such a mesmerising effect on me. Brilliant acting throughout, and none of the gung ho glorification employed by most film directors.
Don't bother with the so-called 'directors cut' - having seen the full uncut version first, this was terribly disappointing, and lost much of the atmosphere and outstanding content of the original.