Before the advent of the internet, the telephone and the telegraph, the state of the art method of communication was the Postal Service. The speed of this service was a function of the speed of the ship, the horse and the cart. History is replete with examples of orders issued being overtaken by events. Take the example of commands from England. They could take five months to reach the Cape.
Main picture: A Post Cart crossing the drift at the bottom of Van Staden’s Pass