Against an army of zombies, no armies could stand. Why, even blown half to bits, undaunted by fire and gas, zombies would fight on so long as the brain cells which receive and execute commands still remained intact.
15 seconds sound clip from the Revenge of the Zombies (1943) movie soundboard.
You can hear this line at 00:25:53.000 in the DVD version of the movie.
Quote context
[...]
- I had already experimented with various subjects. Lazarus who brought you in was one of them.
- And what greater destiny could my wife have achieved than to serve me and, through me, our country?
- I shall take her there and demonstrate that zombies must obey their master.
- Watch this. Your brain works in independency of mine. Go back.
- I must make still another experiment. Apparently I've succeeded too well this time.
- When will you be prepared to come then?
- I'll let you know. I shan't need more than a day or two.
[...]