| Royal Berkshire Militia 3rd (Reserve) Battalion, Royal Berkshire Regiment | |
|---|---|
| Active | 1661–1 April 1953 |
| Country |  England 1661–1707 Kingdom of Great Britain (1707–1800) United Kingdom (1801–1953) |
| Branch |  Militia/Special Reserve |
| Role | Infantry |
| Size | 1 Battalion |
| Part of | Royal Berkshire Regiment |
| Garrison/HQ | Reading, Berkshire |
| Motto(s) | Pro aris et focis |
| March | The Berkshire Militia March |
| Engagements | Battle of Worcester |
| Commanders | |
| Notable commanders | Jacob Astley, 1st Baron Astley of Reading Montagu Bertie, 7th Earl of Abingdon |
The Royal Berkshire Militia was an auxiliary[a] military regiment in the county of Berkshire in Southern England. From their formal organisation as Trained Bands, in 1572 and their service during the Armada Crisis and in the English Civil War, the Militia of Berkshire served during times of international tension and all of Britain's major wars. The regiment provided internal security and home defence but sometimes operated further afield, relieving regular troops from routine garrison duties and acting as a source of trained officers and men for the Regular Army. It later became a battalion of the Royal Berkshire Regiment, and prepared thousands of reinforcements for the fighting battalions of the regiment in World War I. After 1921 the militia had only a shadowy existence until its final abolition in 1953.
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