He's paying tribute to the Free French forces under De Gaulle and Leclerc.
7 seconds sound clip from the Patton (1970) movie soundboard.
You can hear this line at 01:43:49 in the Blu-ray version of the movie.
Quote context
[...]
- Well, I just thought you might be feeling kind of low, sir.
- Your writin' things are here on the desk, sir.
- Yeah, uh, Thank you, George.
- One little dog face. One measly little slap. That's what done it.
- Oh, I wish I'd kissed the son of a bitch.
- He's paying tribute to the Free French forces under De Gaulle and Leclerc.
- France will be free again. I give you my word.
[...]