There’s a good book on the history of chemical and biological weapons since WW1 called “A Higher Form of Killing”[1]. The sections on Anthrax are particularly scary because the fallout from widespread Anthrax bombing is harder to clean up than nuclear weapons - while nuclear fallout decays at a predictable rate and the immediate radiation danger decays rather quickly, Anthrax spores are much more resilient to the environment. They can remain dormant in the soil and resist heat and cold. You can’t just wait for them to go away; you need to deliberately clean them up.

The British actually started to lean on Anthrax as their “Plan B” in case of a German invasion during WW2. If German troops made landfall in Britain, Churchill’s plan was to essentially carpet bomb Germany with 500,000 Anthrax cluster bombs he ordered from the United States (though the US never produced that many).

This would, in effect, be an intentional genocide of all of Germany. The country, most likely, would have become uninhabitable even to this day.

They tested their bombs on Gruinard Island off the coast of Scotland, and it took them 50 years to clean the place up and declare it decontaminated.[2]

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[1] jeremypaxman.co.uk/book/a-higher-form-of-killing

[2] en.wikipedia.org/wiki/Gruinard_Island#Biological_…