How many men die in the first battle of the All Quiet on the Western Front film and how do you know?

(from the original film version of the novel directed in 1930 by Lewis Milestone)

In the film, nearly half the men of the Second Company die in the first battle.  The viewers know this because when the men return, they are going to be fed and the cook has prepared food for 150 men.  It is obvious that there are not this many men lined up for food.  The cook asks the men for the count, and there are only eighty men left.  Similar to the book, an argument ensues about whether or not the men can eat the leftover rations of their fallen comrades.

In the novel, Paul narrates the casualities of the battle, so this detail has been adapted for the film version.