I think he saw clearly that France would be a gigantic money pit. Edward III and Henry V both made significant gains in France, but the French just ended up reconquering their territory.It’s not a civil war where nobles will switch sides because you won big in a pitch battle or two. The territory’s also too big, and the English army too low in number to really concentrate against repeated attacks by the French.The biggest mistake I think Edward IV made was in his war against France. Louis the Spider had a really weak situation with the Burgundian threat, and Edward had amassed a formidable army, was a great commander, and had the potential to drive home a real English return to the continent.
By basically being paid off, he alienated his brothers, who expected offices and riches, and missed a big opportunity to take advantage of a weakened France. The history of English betrothals to the French crown is mostly a failed one.
A far better plan would have been to marry Cecily or Elizabeth of York to Francis II of Brittany, with Brittany's rights and even territorial claims being asserted in a conflict with France in exchange for giving up the Lancasters.
England's claims on France were a very real objective. Many of Edward's supporters had lands they still considered theirs in France. The funding for the war, the army, the situation, it was all there for a great campaign ending in land concessions that were serious. Aquitaine, or at least Gascony, Normandy, and perhaps even Anjou, as well as an expanded Pale, were possible
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