Trying to apply macro to all files under a folder

I found a ref to this and some commands that should work, but wont for me.

In my site directory, are other directories and files. I have a macro that I created, @b that i want to run recursively on all files named index.md in all the folders in site.

I had initially set CWD to the site directory.

In vim i did:

: args inde*.md

(Thinking this should put all the index.md files into the arg list. That didn't work, it only found the one index.md file in site.)

My next step would have been:

:argdo :normal @b

(That works for the one file it found.)

Then i would save my files:

:argdo :write

Should this work? How can I get this to work. All examples I've found describe this, but it doesn't want to work for me. 

Any help is greatly appreciated!

Thanks,

Russ

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