St Albans was the scene of two separate battles during the Wars of the Roses, in 1455 and 1461. Although both involved the struggle between the supporters of Lancaster and York, they occurred under different circumstances and across different parts of the town and its surroundings. The first was a comparatively small but politically momentous encounter in the streets. The second was a larger campaign battle associated with the northern approaches. Together they show how royal authority became entangled with aristocratic rivalry and recurring armed force.

On 22 May 1455, Richard, Duke of York, and his allies the earls of Salisbury and Warwick confronted Henry VI's supporters at St Albans. Negotiations failed, and Yorkist troops attacked defended entrances to the town. Warwick's men found a way through the built environment and into the Royalist position. The Duke of Somerset, the Earl of Northumberland and Lord Clifford were killed. Henry was wounded and taken into Yorkist custody, making possession of the king an immediate political consequence of the fighting.

The first battle is conventionally treated as the opening armed conflict of the Wars of the Roses, although its causes developed over many years. York did not become king after his victory. Instead, the struggle continued through shifting arrangements for government, questions about Henry's capacity to rule and the influence of rival magnates. Deaths at St Albans also created grievances among powerful families. The encounter therefore produced both an immediate change in access to the monarch and motives for revenge that complicated later attempts at reconciliation.

The second battle, on 17 February 1461, followed the defeat and death of the Duke of York at Wakefield. Lancastrian forces associated with Queen Margaret of Anjou advanced south and overcame Warwick's army around St Albans. Henry VI, who had been with the Yorkists, was recovered by his supporters. Nevertheless, the victory did not secure lasting control of the kingdom. Within weeks, York's son Edward was proclaimed king, and the opposing causes met again in the much larger battle of Towton.

Modern streets, buildings and open spaces preserve only a partial impression of these medieval encounters. The first battle's urban setting differs from the broader landscape of the second, and the exact locations of some movements remain debated. A responsible interpretation separates documented events from later local traditions rather than assigning every episode a precise surviving landmark. Viewed together, the battlefields explain why capturing a king, winning a military action and establishing a durable government were three different achievements in fifteenth century England.