1.   As soon as they were taken from shelter, they began to slide on locked wheels over the yard, and then to tilt.

2.   Because the car is sliding with locked wheels, turning the steering wheel will have no effect whatsoever.

3.   A locked wheel has lost traction, and to regain it, you have to allow the wheel to rotate.

4.   In deep mud, sand, dirt etc., those locked wheels will slowly churn and dig you out of the hole.