Marching is read as discipline and moving in step with a group. Dream books ask whether the rhythm felt like shared purpose or like orders followed against your will.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.