This is the big air battle scene (in two parts) from Howard Hughes' classic. As many know from the "Aviator", he re-filmed it all to be a talkie with some colour (?).
This scene is filmed in Blue-O-Vision (Trademark me). I'd recommend playing it full screen and screw with your monitor contrast and brightness settings to make it more viewable. You may have to refresh the page to see part two as it doesn't always get displayed.
From IMDb, the plot:
"Two brothers attending Oxford enlist with the RAF when World War I breaks out. Roy and Monte Rutledge have very different personalities. Monte is a freewheeling womanizer, even with his brother's girlfriend Helen. He also proves to have a yellow streak when it comes to his Night Patrol duties. Roy is made of strong moral fiber and attempts to keep his brother in line. Both volunteer for an extremely risky two man bombing mission for different reasons. Monte wants to lose his cowardly reputation and Roy seeks to protect his brother. Their assignment to knock out a strategic German munitions facility is a booming success, but with a squadron of fighters bearing down on them afterwards, escape seems unlikely. Written by Gary Jackson <garyjack5@cogeco.ca> "Update: I got the post order backwards. View bottom to top.