Answer:
A house with two occupants, sometimes one, rarely three. Break the walls, eat the boarders, then throw away me.
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. The wind is my lover, one-legged am I. Name me and see me at home in the sky.
There is an ancient invention. Still used in some parts of the world today. That allows people to see through walls.
The sharp slim blade, that cuts the wind.
Born in the ocean and white as snow. When I fall back to water I disappear without a trace.