Legionary Insignia

[Tarbicus]

In a hanger in form of increasing and phallus for strap of cavalry, there is a clinched Eagle. Does it mean this that belonged to concretly wing of the Roman cavalry? Or was this sign of Jupiter used by the whole Roman army in general?

It must be safe IMHO to connect the eagle wings to Jupiter, as well as the thunderbolts (often referred to as the 'ice cream cones' or 'unicorn horns'). I'd say the eagle is Jupiter, but that's only my opinion.