The Battle of Dunbar was fought between the English New Model Army, under Oliver Cromwell and a Scottish army commanded by David Leslie, on 3 September 1650 near Dunbar, Scotland. The battle resulted in a decisive victory for the English. It was the first major battle of the 1650 invasion of Scotland, which was triggered by Scotland's acceptance of Charles II as king of Britain after the beheading of his father, Charles I on 30 January 1649.

After the battle, the Scottish government took refuge in Stirling, where Leslie rallied what remained of his army. The English captured Edinburgh and the strategically important port of Leith. In the summer of 1651 the English crossed the Firth of Forth to land a force in Fife; they defeated the Scots at Inverkeithing and so threatened the northern Scottish strongholds. Leslie and Charles II marched south in an unsuccessful attempt to rally Royalist supporters in England. The Scottish government, left in an untenable situation, surrendered to Cromwell, who then followed the Scottish army south. At the Battle of Worcester, precisely one year after the Battle of Dunbar, Cromwell crushed the Scottish army, ending the war.