Infantry Units

What are the relative sizes of the named units?

It varies from service to service, country to country, and era to era, but I found this listing of U.S. Army unit sizes (PDF) in the late 20th century:

Note that “an Army” (the top-most division) is not “The Army.” When we speak of the Army, we mean every single person in the Army. But an Army is a subdivision of that. The Army actually consists of multiple armies.

The U.S. Army itself has a multimedia tool that lets you click through descriptions of the sizes (but it’s hard to link into).

The differences between the list above are:

For the UK, I cobbled together the following list from multiple sources. It’s very close to the U.S. structure:

There doesn’t seem to be any mnemonic to this. You just have to memorize them, I guess.

Why I Looked It Up

I was reading a history of World War 1, and the unit sizes are used constantly. I couldn’t figure out what was big and what was small, and what was bigger or smaller than anything else.

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