The Battle of San Pietro

The Battle of San Pietro is a 1945 John Huston documentary short (30+ minutes) about the WW2 battle.

You can watch it from Internet Archive:


There is some information on the film at this site.
1001 Flicks has a review. This NYT article says,

'The Battle of San Pietro'' stands alone in the history of documentary filmmaking. Presenting the battle in the Liri Valley as a costly continuing campaign rather than in retrospect as a strategic victory, it is the only complete record of an infantry battle.