If you watch enough of the classic-era cartoons, especially the ones from the 1930s to the mid-'40s, you'll read a lot of incredibly-corny signs, letters and other things filled with plays-on-word and puns of all type. This cartoon offers a great example.
Porky is trying to get the ducks from eating his hens' feed. He pleads with them and then mildly threatens them. Their response is this letter:
"Fowl Ones - Let's talk TURKEY. You're too COCKY. We think you EGGS are CHICKEN. Why don't you quit CACKLING and fight - you dumb CLUCKS! Signed - Gen. QUACKO, DUCKtator."
You get the idea.
The hens see the note and are now inspired to fight back. The mobilize an army, and the war is on between the hens and the ducks, complete aerial bombers, naval artillery and ships, you name it; even a "no man's land" in the middle renamed "No Hen's Land" with WWI-style trench warfare on each side.
Actually, a number of the sight gags are very inventive. The Ducks, by far, are the funnier of the two sides. Daffy joins the fray, armed to the teeth and asks, "Which way to the front?" After he's told, he speeds off in the opposite direction!
This cartoon is part of the Looney Tunes Golden Collection Volume Five and is the last one in the set, making the package end with a real winner!