Animals used in War

Does that involve birds having gunpowder on their backs? It is because I've seen a medieval motiff or a painting on the Internet in which cats and birds have fireworks in their backs.
No Olga of Kiev is pre Gunpowder, she had her men tie sulfur soaked rags to the birds feet
 
Seriously?! Could you give a source I'd love to see how that worked out?

I'm afraid I couldn't find anything accessable. My friend's family has old photos of it, thanks to an ancestor in the Wehrmacht, which is how I know about it. I'm sure there are other sources, but I can't think of any. From what I understand, they were pretty effective when released in groups.
 
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