Answer:
What's the capital of France?
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
I canβt go left I canβt go right. I am forever stuck in a building over three stories high.
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. What am I?
What is easy to get into but hard to get out of?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.