| Formation of the Volunteer Force | ||||
| 1859: | 1st Pembrokeshire RVC raised │ |
1st Haverfordwest RVC raised │ |
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| 1860: | 2nd Pembrokeshire RVC raised 3rd Pembrokeshire RVC raised │ │ │ |
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1st Cardiganshire RVC(Ⅰ) raised 2nd Cardiganshire RVC(Ⅰ) raised 3rd Cardiganshire RVC(Ⅰ) raised 4th Cardiganshire RVC raised │ |
1st Carmarthenshire RVC raised 2nd Carmarthenshire RVC raised 3rd Carmarthenshire RVC raised 4th Carmarthenshire RVC raised │ |
| 1861: | 4th Pembrokeshire RVC raised │ all part of 1st Administrative Battalion of Pembrokeshire Rifle Volunteers │ │ |
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3rd Cardiganshire RVC(Ⅰ) disbanded 4th Cardiganshire RVC becomes 3rd(Ⅱ) │ │ │ │ │ |
5th Carmarthenshire RVC raised 6th Carmarthenshire RVC raised │ all part of 1st Administrative Battalion of Carmarthenshire Rifle Volunteers │ |
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| 1862: | 1st Haverfordwest RVC added │ |
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| 1863: | 4th Pembrokeshire RVC disbanded │ |
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| 1864: | 2nd Pembrokeshire RVC converted to 2nd Pembrokeshire Artillery Volunteer Corps │ |
1st Cardiganshire RVC(Ⅰ) disbanded 2nd Cardiganshire RVC(Ⅰ) becomes 1st(Ⅱ) 3rd Cardiganshire RVC(Ⅱ) becomes 2nd(Ⅱ) |
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| 2nd Cardiganshire RVC(Ⅱ) added │ │ |
1st Cardiganshire RVC(Ⅱ) joined 1st Administrative Battalion of Montgomeryshire Rifle Volunteers |
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| 1869: | │ │ |
4th Carmarthenshire RVC disbanded │ |
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| 1872: | │ │ |
6th Carmarthenshire RVC absorbed by 2nd │ |
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| 1873: | 2nd Cardiganshire RVC(Ⅱ) becomes 1st(Ⅲ) │ |
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| 1875: | │ | 3rd Carmarthenshire RVC disbanded | ||
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| 1st Carmarthenshire RVC added 2nd Carmarthenshire RVC added 5th Carmarthenshire RVC added │ |
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| Consolidation and renumbering of the Volunteer Force |
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| 1880: | consolidated as 1st Pembrokeshire (Pembroke, Carmarthen, Cardigan and Haverfordwest) Rifle Volunteer Corps │ |
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| The creation of the territorial regiments by the Childers reforms |
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| 1881: |
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| 1887: | 1st (Pembrokeshire) Volunteer Battalion, The Welsh Regiment |
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| Creation of the Territorial Force | ||||
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| 1908: | 4th Battalion, The Welsh Regiment (TF) |
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| 1914/ 1918: |
1/4th Battalion, 2/4th Battalion, 3/4th Battalion, The Welsh Regiment │ |
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| Creation of the Territorial Army | ||||
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| 1921: | 4th Battalion, The Welch Regiment (TA) |
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| 1937: | 4th (Carmarthenshire) Battalion, The Welch Regiment (TA) │ |
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| 1939: | 4th (Llanelly) Battalion, The Welch Regiment (TA) │ |
15th (Carmarthenshire) Battalion, The Welch Regiment (TA) │ |
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| Resurrection of the Territorial Army | ||||
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| 1947: | 4th (Carmarthenshire) Battalion, The Welch Regiment (TA) │ |
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| Creation of the Territorial and Army Volunteer Reserve |
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| 1967: | disbanded and formed elements of C Company (Welch), The Welsh Volunteers and B Company, C Company, 4th (Territorial) Battalion, The Welch Regiment |
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