"Verdun, September 1916" bookends. They were shot with George Hall in a plane, probably somewhere over the USA
Short summary of the content:
Old Indiana Jones is sitting in a plane, next to a wall street broker, who is know as the "Pirate of Wall Street". He tells Indy about his plans, to break up the company and to sell it, plane by plane. Indy gets very upset, because the man obviosuly doesn't care what's gonna happen to the employes. Therefore Indiana tells him, how he was in the Battle of Verdun and met General Nivelle, who like the broker, didn't care about the consequences of his actions on the little guy. The Pirate doesn't show the slightest interest in Indy's story, falling asleep during it.
What we find out about Indiana Jones:
Theodore Roosevelt introduced Indy to guns in the British East Africa Episode, and in the Verdun episode, Indy increases his knowledge about them, by finding out about the "Big Bertha" howitzers. It's the first episode Indy speaks German in, and since this is the first real war episode in the series (by airing), we first see, that Indy obviously regrets ever joining up for the war.
Elements, that got lost in the DVD versions:
In the linking segment of the re-edited version, Remy is obviously criticizing Indy for the actions he took at the end of the episode, besides the fact that Indy probably saved his life. Blowing up his motorbike was a great thing to do and in the bookends we see that Old Indy is proud, that he did, what he could, to save hundreds of lifes. Very sad irony, in my opinion, that Indy's actions couldn't save those soldiers and they only got "to live a day longer".
Words of Wisdom and Moral:
While Remy failed to see, what a great thing Indy did, Old Indy is still proud of what he did, because even though he really didn't have any power, he tried to make a difference, something Nivelle failed to do.