Topic: What do the different attack colors mean?

When attacking enemy tribes, I can pick the soldiers I want to send into battle in the attack dialog.

Each soldier is marked in the background with a color from the rainbow spectrum: red, orange, yellow, green, turquoise, blue, or purple.

What exactly do the colors mean? Why are there colors such as turquoise, blue, and purple in addition to red, orange, yellow, and green?

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