In 1420, Henry faced an uphill battle again; his negotiations had failed with both Dauphinists and Burgundians, and instead they'd patched it up. So he faced an alliance - Dauphinist, Armagnac, Orleanist, Burgundian - Scot - against the English. And then came a meeting on a bridge that changed everything.
For those of you who enjoyed Kevin Stroud's History of English segment, here's a link to his website and his estimable podcast - The History of English.
By the way...for some reason, Kevin's bit only comes out of one channel. Sorry about that, when I find a moment I'll put it right. For the moment, make sure you've got two speakers working.