What were the causes of the second English Civil War and why was there almost no fighting at all?

Question

what were the causes of the second English Civil War and why was there almost no fighting at all?

Answer 1

Charles I took advantage of the deflection of attention away from himself to negotiate a new agreement with the Scots, again promising church reform, on 28 December 1647. Although Charles himself remained a prisoner, this agreement led inexorably to the Second Civil War.

A series of Royalist uprisings throughout England and a Scottish invasion occurred in the summer of 1648. Forces loyal to Parliament put down most of the uprisings in England after little more than skirmishes, but uprisings in Kent, Essex and Cumberland, the rebellion in Wales, and the Scottish invasion involved the fighting of pitched battles and prolonged sieges.

In the spring of 1648 unpaid Parliamentarian troops in Wales changed sides. Colonel Thomas Horton defeated the Royalist rebels at the Battle of St Fagans (8 May) and the rebel leaders surrendered to Cromwell on 11 July after the protracted two-month siege of Pembroke. Sir Thomas Fairfax defeated a Royalist uprising in Kent at the Battle of Maidstone on 24 June. Fairfax, after his success at Maidstone and the pacification of Kent, turned northward to reduce Essex, where, under their ardent, experienced and popular leader Sir Charles Lucas, the Royalists had taken up arms in great numbers. Fairfax soon drove the enemy into Colchester, but his first attack on the town met with a repulse and he had to settle down to a long siege.

In the North of England, Major-General John Lambert fought a very successful campaign against a number of Royalist uprisings — the largest that of Sir Marmaduke Langdale in Cumberland. Thanks to Lambert's successes, the Scottish commander, the Duke of Hamilton, had perforce to take the western route through Carlisle in his pro-Royalist Scottish invasion of England. The Parliamentarians under Cromwell engaged the Scots at the Battle of Preston (17 August – 19 August). The battle took place largely at Walton-le-Dale near Preston in Lancashire, and resulted in a victory by the troops of Cromwell over the Royalists and Scots commanded by Hamilton. This Parliamentarian victory marked the end of the Second English Civil War.

Nearly all the Royalists who had fought in the First Civil War had given their parole not to bear arms against the Parliament, and many honourable Royalists, like Lord Astley, refused to break their word by taking any part in the second war. So the victors in the Second Civil War showed little mercy to those who had brought war into the land again. On the evening of the surrender of Colchester, Parliamentarians had Sir Charles Lucas and Sir George Lisle shot. Parliamentary authorities sentenced the leaders of the Welsh rebels, Major-General Rowland Laugharne, Colonel John Poyer and Colonel Rice Powel to death, but executed Poyer alone (25 April 1649), having selected him by lot. Of five prominent Royalist peers who had fallen into the hands of Parliament, three, the Duke of Hamilton, the Earl of Holland, and Lord Capel, one of the Colchester prisoners and a man of high character, were beheaded at Westminster on 9 March.