From the 10th of August until the 5th of September, the city of Gloucester was under siege by the Royalist forces.
Colonel Edward Massey was the military governor for the city, which had all through the Civil war been a Parliamentary stronghold.
Massy was only in his twenties & had offered his military services to the king, but had been turned down, so after being accepted by Cromwell fought for Parliament.
The king had his headquarters on the slope of Robinswood hill at Matson House, his lieutenant, Prince Rupert lodged at Prinknash Park.
The Royalists never managed to take the city of Gloucester, & it is said their failure was a turning point in the Civil War.