I'm not so sure after only one battle.
7 seconds sound clip from the Patton (1970) movie soundboard.
You can hear this line at 00:31:28 in the Blu-ray version of the movie.
Quote context
[...]
- You know who the poet was? Me.
- Sir, the interrogation reports on the American prisoners captured in our victory at Kasserine.
- Danke.
- They are not very good soldiers, these Americans.
- I'm not so sure after only one battle.
- Their tanks were no match for our guns.
- And neither was their leadership, sir.
- At Kasserine they were not under American command. They were under the British General Anderson.
- British commanders and American troops... the worst of everything!
- I remind you that Montgomery is a British Commander. And he has driven us half way across Africa.
[...]