And I said to Achilles,

“Why so Sirius?”

He looked at his armor,

“It makes me impervious!

You mortals can’t manage!

Just avoid the ankle!

‘Cause that might do damage!”

Found this when trying to find an illustration. Sirius/Achilles

It says here Sirius was once red which explains why it was associated with war in The Iliad, so is Paris/Betelgeuse, Mars.