How much of a difference would make if Battle of Tewkesbury would have end with a complete victory of House of Lancaster instead? Any long lasting effects on English monarchy and future succesion system?
 
Does "complete victory" imply Edward IV, Clarence, and Gloucester are all killed? Because otherwise they might escape to the continent and attempt to recover the throne later.
 
The preferred outcome for the Lancastrians in that campaign would have involved them not fighting at Tewkesbury at all. Queen Margaret was a good strategist and she realized early that she did not command a sufficient force at the moment to fight Edward and his army. She needed to withdraw into Wales, into her powerbase, and link up with the reinforcements being gathered by her most steadfast ally Jasper Tudor. She had even feinted a march one direction in order to evade Edward and instead march toward Gloucester. Edward was completely fooled and was waiting to meet her army. He immediately realized what she was doing instead and adjusted his plan. Somehow, he managed to get word to Gloucester to not allow Margaret passage across the bridge on the Severn.

Margaret was refused entry and was forced to find another crossing, having to use a ferry crossing near Tewkesbury. The ferry would have been much slower than having access to the bridge and she knew it. Knowing Edward was bearing down on her, she had no choice but to stand and fight, where she was finally and decisively defeated.

Had Margaret been allowed passage through Gloucester, she would have successfully escaped into Wales, regrouped with Tudor, and consolidate her positions. The entire war would have dragged on longer, buying more time for Margaret to tussle up more support, allowing more time for her own son Edward of Westminster to gain experience and learn on the job, and most importantly, sire his own children, sons particularly. A Prince Edward now of age is the undisputed leader of the Lancastrian faction and is officially claiming for himself his birthright to the crown of England. Margaret's immediate task to guide her son to this point would have been more or less successful, given the circumstances. She somehow managed to guide him along this far, sacrificing everything for his cause. She would still continued supporting him, but she would no longer be burdened with overall leadership of his faction.

In OTL, Margaret was up against heavy odds at Tewkesbury. Edward successfully managed to maneuver Margaret into a bad position. In fairness, her plan deserved to succeed. It was a great plan and almost worked. It's to Edward's credit that he reacted to it so well.

If Margaret wins any kind of battle at Tewkesbury, it's one that sees Edward decide to withdraw after suffering heavy casualties. Margaret immediately finds a way to get the remainder of her army into Wales, but now it will take even more time and money to raise the needed troops to raise her army into something that can challenge Edward.
 
The preferred outcome for the Lancastrians in that campaign would have involved them not fighting at Tewkesbury at all. Queen Margaret was a good strategist and she realized early that she did not command a sufficient force at the moment to fight Edward and his army.

In OTL, Margaret was up against heavy odds at Tewkesbury. Edward successfully managed to maneuver Margaret into a bad position. In fairness, her plan deserved to succeed. It was a great plan and almost worked. It's to Edward's credit that he reacted to it so well.

If Margaret wins any kind of battle at Tewkesbury, it's one that sees Edward decide to withdraw after suffering heavy casualties. Margaret immediately finds a way to get the remainder of her army into Wales, but now it will take even more time and money to raise the needed troops to raise her army into something that can challenge Edward.

Had Margaret been allowed passage through Gloucester, she would have successfully escaped into Wales, regrouped with Tudor, and consolidate her positions. The entire war would have dragged on longer, buying more time for Margaret to tussle up more support, allowing more time for her own son Edward of Westminster to gain experience and learn on the job, and most importantly, sire his own children, sons particularly. A Prince Edward now of age is the undisputed leader of the Lancastrian faction and is officially claiming for himself his birthright to the crown of England. Margaret's immediate task to guide her son to this point would have been more or less successful, given the circumstances. She somehow managed to guide him along this far, sacrificing everything for his cause. She would still continued supporting him, but she would no longer be burdened with overall leadership of his faction.
TBH, I didn't though about that. Good Point, but perhaps there is still a chance for a victory against the odds - maybe all Queen needs is for Edward York to get an arrow to the eye or have a tragic horse accident during charge?

But perhaps you are right, and more fitting POD would be just to let Lancasterians win the entire war, without playing too much with details.
 
Best possible outcome is that Margaret withdraws to Wales and with her reinforcements from Jasper Tudor Margaret then Confronts the Yorkists at
Tewkesbury
 
Any idea how the England would look like after this alter-Tewskesbury - Where Lancasterians were able to crush Yorksist oppoosition? I mean for now, the trone seems to be secured, but there is still a lot of amibtious aristocrats in England. Any potential later Yorksist pretenders? Who will be Edward Westminester (a "real" kind Edward IV?) hair? Any chance for a potential Beaufort succesion in a near future? Any chance for a "brothers before daughters" rule in England? And what about Wales?
 
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