(Photo: Arrow added from original on Wikipedia Commons: https://commons.wikimedia.org/wiki/File:Colosse-dj%C3%A9houtih%C3%A9tep2.jpg)
In the picture of moving a large statue, people are pulling in the front. One man is pouring water to sandy ground. Each rope will pull the sleigh from different directions: reacting friction force is weak from the collapse of sand. Poured water will harden the sand. The statue will move forward because of the collapse of dry sand in the front. Like a rectilinear locomotion.