"It's the sand robbers, hurry up, run!" Erik the merchant quickly mounted his horse, cut the rope of one of the carts, and then the others galloped off with their load.
Erik was a veteran desert merchant, with twelve people in his caravan, all old buddies. They traversed this trade route year-round. He was familiar with every sand dune, every gobi desert, and every oasis. He knew the habits of the sand robbers well, so he always managed to avoid them.
After all, if he hadn't been able to, his caravan would have broken up long ago, and it would be hard for him to keep his own head on his neck.
Despite this, Erik always carried some 'tribute'. It contained necessities that the sand robbers liked, such as hemorrhoid cream, sunburn ointment, cloth, tea, sewing needles, aphrodisiacs, etc. These items weren't expensive, but the sand robbers loved them.