world war one - What can I learn from these WW1 shell cases

We found these two shell cases in my parents garage. They were allegedly brought back from France by my great grandfather, but that’s all we know and we’d really like to know more about them and

For Veterans Day and the 100th anniversary of World War I, see the

Shell International Encyclopedia of the First World War (WW1)

How was Life During World War I: A Look into Turbulent Times

The Shock of War, History

Hearing Loss in the Trenches of WWI

10 Facts About World War One Artillery

This Explosion Was the Biggest Blast Before Atomic Bombs

Shell (projectile) - Wikipedia

The history of forgetting, from shell shock to PTSD - ABC listen

I received from my grandfather years ago a WW1 Naval 3 inch shell

Shell International Encyclopedia of the First World War (WW1)