Why is this the answer?

The answer is flag because this clever riddle uses many wonderful clues to describe a very special and important object. A flag is much more than just a piece of cloth; it is a symbol that represents a country, a state, or even a favorite sports team. Let's look closely at the riddle's hints. When the riddle says, "I march before armies, a thousand salute me," it is talking about how a flag is often carried right in front of a marching group, like soldiers or a parade band. People show respect by standing still or giving a salute as the flag passes. This is because the flag stands for all the people it represents, and saluting it is a way to show honor and pride. The next line gives us a clue about winning: "My fall can bring victory, but no one would shoot me." In wars, capturing the enemy’s flag and making it "fall" was a huge sign that you had won the battle. Even though the flag is at the center of the fighting, it is not a soldier, so the idea of no one shooting it is a word trick. It is a piece of fabric, not a person. The riddle then gives us a great picture: "The wind is my lover, one-legged am I." The wind is what makes the flag fly, making it look beautiful and bright up in the air. This makes the wind its "lover." And because a flag is always attached to a single, tall pole, it is "one-legged" as it stands high above the ground. Finally, the riddle tells us to "Name me and see me at home in the sky." We name flags, like the American flag or the state flag of Texas. And where do they live? At home in the sky, proudly waving from the top of the flagpole for everyone to see. Every part of this riddle fits perfectly to describe a simple, powerful flag.