How was Wellington able to win the Battle of Waterloo? Could it have been won without him? Could it have been won without the aid of the Prussians? Why or why not?

Wellington had begun to lose hope in the face of the formidable French army, but as the day wore on, it seemed as if the Prussians might arrive in time to save the troops. In order to hold off Napoleon, Wellington brought out his best brigade that had been held back. The brigade would position itself between the still inexperienced British soldiers and Hougoumont, a decision that would prove to be most wise, as later witnessed during the Crisis of Waterloo.