Chalgrove 1643
Colonel John Urry (who was at Edgehill and Brentford) deserts to the Royalists with information about the parliamentarian forces and their baggage. In particular, Prince Rupert finds out about a Parliamentarian pay wagon due to arrive on June 18th.
Rupert decides to lead a force to try to disrupt the enemy lines and capture this money.
Jun 17 Rupert leaves Oxford in the evening with 1800 men. 

 
Essex had set up his HQ at Thame.

Rupert led three regiments : his own, the Prince of Wales', and Lord Percy's.
Jun 18 He crosses the River Thame at Chiselhampton and arrived at Tetsworth at 1 a.m.

He captured an officer and 9 men at Postcombe at 3 a.m. and arrived at Chinnor at 5 a.m. Here he found 200 Parliamentarian dragoons who had returned from the unsuccessful trip to Islip. Rupert killed 50 of them and captured 120. The commotion however alerted the pay wagon which escaped to hide in nearby woods.

 

  

 

 

By the time Rupert and his men had got to Chinnor, they had crossed right through the Parliamentarian lines.
Rupert headed back towards Oxford. He sent some of his men on ahead to secure the bridge at Chiselhampton, and ordered his dragoons to hide behind the hedges leading to the bridge as a trap.

Before this could be properly set up eight troops of Parliamentarian horse had caught up with him and Rupert turned to meet them at a cornfield at Chalgrove. The Parliamentarian dragoons were using a hedge to fire on the Royalists and Rupert led a charge through the hedge while another regiment (O'Neale) went round it.

 
Percy's regiment followed Rupert through the hedge and the enemy were routed and were chased off the field. Many Parliamentarians were killed but the Royalists had only lost 12 men. John Hampden had arrived just as the Parliamentarian forces were running from the field. He tried to rally them but received a wound in his shoulder from which he died six days later.

The monument marking the site of the battle of Chalgrove field.

 Sir John Urry was knighted for his services.
Parliament : Sir Philip Stapleton, John Hampden

Royalists : Prince Rupert, Lord Percy, Lord Wentworth, O'Neale, Henry Lunsford.