What happens
York arrives from Ireland with his army, claiming his right to the throne. Buckingham asks his intentions; York claims he only wants Somerset removed. When Somerset appears with the queen, York openly denounces Henry as unfit to rule and declares himself the rightful king. Edward and Richard stand as his sureties. Salisbury and Warwick defect to York's side, swearing his claim is just. Henry, unable to command obedience, watches his authority crumble as the nobles prepare for war.
Why it matters
This scene marks the final collapse of Henry's kingship. York's arrival catalyzes the play's central conflict: the claim to the English throne is no longer a secret whispered in gardens but a public assertion, made in the king's face. York's initial pretense—that he comes only to remove Somerset—dissolves instantly when Somerset appears. York abandons diplomatic language and speaks the unspeakable: Henry is not fit to rule. The dramatic irony is sharp: Henry has already imprisoned Somerset to appease York, yet this act of submission only reveals Henry's weakness. By granting York's demand, Henry proves York's point. Authority, the scene suggests, cannot survive on goodwill alone; it requires the power to enforce obedience, which Henry lacks entirely.
The defection of Salisbury and Warwick is the scene's turning point. These are not minor figures but the pillars of the realm. Salisbury's argument—that swearing an oath to sin is itself a sin—is sophistry, but it is eloquent sophistry. More importantly, it gives moral cover to naked political calculation. Warwick's invocation of the bear and the chain (the Nevil emblem) signals that the old guard is switching sides. By scene's end, York stands surrounded by sons and supporters while Henry stands with only Clifford and the queen. The stage itself becomes a map of power: York occupies the center, Henry the margins. Words have failed Henry; now only swords will speak. The play moves from court intrigue to open civil war, and the audience understands that Henry's reign is effectively over, even if his crown remains on his head.
