Battle of Towton

"...We must not tarry," said Margaret; " let us part here — you for Dijon

— I to Aix, my abode of unrest in Provence. Furewell — we may meet in a better hour—yet how can I hope it? Thus I said on the morning before the fight of St. Albans — thus on the dark dawning of Towton — thus on the yet more bloody field of Tewkesbury — and what was the event? Yet hope is a plant which cannot be rooted out of a noble breast, till the last heart-string crack as it is pulled away..."

From Scott's "Anne of Geierstein".

The Battle of Towton occurred on March 29, 1461.  The Yorkists, under King Edward IV won the battle decisively, giving the Lancastrians a crushing blow.  Edward had claimed the throne on March 4, 1460 soon after the death of his father Richard.  Edward held the throne until 1470, when Lancastrian King Henry IV was restored to power.  Henry's second reign ended the next year, with the Battle of Tewkesbury, after which Edward was himself restored to the throne.