80cm Schwerer Gustav Shell, Daniel Perez Sutil

Why was there such a great difference between calibers of field artillery during WWI and WWII? - Quora

What are some interesting facts about World War 1 artillery? - Quora

Is it safe to use a crow bar to lift an old WW2 tank/cannon shell (off the rocks) if it has been sitting on the ocean floor for 70+ years? If not

How has artillery's use changed throughout the 20th century? - Quora

With the amount of artillery shells fired by both sides during both World Wars, were there any instances where the shells collided in the air? - Quora

What is the largest heavy artillery piece/gun ever used during a war thus far? - Quora

Why were 75mm cannons a standard cannon throughout much of WWII? - Quora

What kind of artillery in the world wars used fixed ammunition, what type semi-fixed and what type separated? - Quora

How useful was captured artillery during World War I or II given that most countries had differently sized shells? - Quora

In WW2, why did Great Britain use the Hispano cannon on aircraft instead of the Oerlikon cannon? - Quora

During both World Wars, why were railway guns used, considering they are confined to the tracks on which they run? - Quora

What is the largest heavy artillery piece/gun ever used during a war thus far? - Quora

10 Wunderwaffe, or 'Miracle weapons', that Nazis could have used to win WW2 – History Totally Naked

What kind of artillery in the world wars used fixed ammunition, what type semi-fixed and what type separated? - Quora