What is the old war movie where orphaned Chinese fought Japanese soldiers?

You're likely thinking of "The Bridge on the River Kwai" (1957). While not specifically about orphaned Chinese fighting Japanese soldiers, the film does feature a subplot where a group of Chinese prisoners of war are forced to build a bridge for the Japanese.

Here's why it might fit your description:

* "War Movie": It's a classic war movie set during World War II.

* "Old": It was released in 1957.

* "Chinese": The film features a large cast of Chinese actors playing prisoners of war.

* "Japanese soldiers": The film is set in a Japanese prisoner-of-war camp.

However, it's important to note that the Chinese characters in the film are not orphans, and the main focus of the story is the construction of the bridge.

If you can provide more details about the movie, such as the specific plot points or any other actors you remember, I might be able to help you find the exact film you are looking for.