You and your squad of ODST’s were assigned to be dropped onto Sangheilios, to eliminate an elite general During the drop, a Covenant banshee flew into your pod and knocked you several miles off course. You landed in some mountains. After you exited your pod, you saw a lot of Covenant aircraft going to where your squad landed. You decided going there would be a death sentence. After a week of surviving in a small cave and eating the rations you had in your pod, you heard footsteps outside