Red uniforms - Grenadier Guards reasons for wearing red

[Tarbicus]

That's interesting about the colour red, I always thought it was to hide blood, or to be intimidating to the enemy.

In a way, you could say it is intimidating as it would be difficult to tell exactly how many there were, and the impression is of a blur of red approaching. I imagine when the red is set against greener fields or landscape on a bright and sunny day, the effect would be quite startling.