M*A*S*H: It Happened One Night (1975)

Synopsis
The weather outside is below freezing and the enemy shelling is relentless as the 4077th tries to deal with a fresh supply of incoming wounded. The rattled surgeons try to save the life of an equally nervous patient--and it's a toss-up as to who is more scared. Somehow or other, Frank (Larry Linville) finds time to rifle through Hot Lips' tent in search of compromising letters. ~ Hal Erickson, All Movie Guide