Even so, Cambyses didn't give a damn. He stormed Egypt like a jock mowing through a keg party, only to have his ass promptly handed to him. Sure, Cambyses had the numbers, but the Egyptians had the home advantage and far superior weaponry. The Persians were bound to lose the war ... until Cambyses spotted the Egyptians' only weakness: cats.
Back in the day, Egyptians were deathly afraid of cats, which they thought were representatives of death itself. As such, killing a cat was both a terrifying sin and a quick one-way ticket to Death Central. So, according to legend, it is here that the Persians started using cats as shields. Seriously.
Embarrassed artists hid this fact and said Cambyses won just by being really tall.
Also, they lobbed a bunch of felines into the battlefield, to the point where Egyptians could not take a step or swing a sword without the risk of harming a cat. By some accounts, Cambyses supplemented his feline secret weapon with a bunch of other animals Egyptians held sacred, such as ibis birds, dogs, and sheep, thus creating the world's first Battlefield Petting Zoo.
Whatever the reasons behind it, the gambit worked, as the Egyptians were so afraid of accidentally striking a cat that they either fled or just flat out surrendered to the inferior Persian fighting force. Hey, this is what writers at the time say happened, we weren't there. The Persians went on to preside over Egypt for ages to come. Cats went on to lazily rule over man until the end of time itself.