I would agree, not from a bias stance but a logical one, that Wellington has a hard time winning without Prussia. Keep in mind that Prussia keeps Grouchy occupied at Wavre, another key point and does exactly what Napoleon is famous for, divide and conquer.
I know it is a joke when I say Promise not Forgotten, but Blucher's own character was one that holds true to this statement. He very much was man of what he said he would do, and important because unlike Gnesienau, he knew that they needed to co-operate as one force to end the war once and for all and that included the Austrian's and Russian's. When Napoleon comes back it is Wellington as the driving force to make the Congress of Vienna fight and make terms with Napoleon was ONE force combined. Something that until 1813-4 had never been done in earnest. Napoleon is very much only sucessful on being able to make seperate terms with each nation and alllowing him to balance and counterbalance them off of each other and shift forces while at peace with one to another one. 1813-4 in my opinion sees all of Europe in a sort of orchestrated effort against Napoleon, which is key and shows the weakness of having everyone going at your juggular. The Allied Coalition sees this and remembers it in 1815. Blucher and Wellington combined are a force of a very powerful nature, one that if you combined both of them would create quite the officer. Both their strengths and weaknesses compliment each other nicely.
The sad part is Napoleon did look at this as just another battle, he did not udnerstand that the Coalition wanted it over once and for all. He was somewhat cocky and confident that day. Everything that was in his doctrine the Allied forces understood and if they forgot anything Ligny and Quatre Bras reminded them in time.
It reminds me of the movie "Patton" where when Rommel's tanks are approcahing the pass George C. Scott, who plays Patton, starts to defeat Rommel's tanks and yells something to the effect of, "Rommel you SOB I read your book!". This rings clear in my mind with the forces of the Allied Coalition in 1815, I feel that they had all together a firm grasp around Napoleon's head.
Let us not forget that the Dutch at Quatre Bras buy important time for Wellington to assemble his army even though it was at the expense of the Prussian's. Even with their retreat it is key that Prussia did fall back in the direction of Wellington.
The Anglo-Dutch I feel had quite the competant people in their forces, enough to beat Nappy that day. Let us not forget that Lord Rowland Hill is quite the experienced officer, with some very good men underneath him. Even with the questionable Dutch, who I feel are far from questionable and were a very valueable asset to the fight, let us not forget that real credit goes to the 3rd DB Division for turning the Old Guard back.
Again Prussia's enterance on the field forces Napoleon to react and he looses the initiative and in my opinion control of the battle. Many things change history that day, but Wellington was just one of the many reasons why, not the single one.
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