Royal Welch Fusiliers
| Dates | Locations | Higher Formation/Remarks |
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| . | 4th Battalion, The Royal Welch Fusiliers | . |
| 1947.01.01 | Reconstituted in TA with HQ at Wrexham and concurrently amalgamated with duplicate 8th (Denbighshire) Battalion | 158 (Royal Welch Fusiliers) Infantry Brigade |
| . | A Company at Wrexham | . |
| . | B Company at Broughton | . |
| . | C Company at Acrefin | . |
| . | D Company at Denbigh | . |
| 1967.04.01 | Disbanded and concurrently reconstituted as: | . |
| . | A Company (Royal Welch Fusiliers), Welsh Volunteers, formed in TAVR II at Wrexham | . |
| . | 4th (Territorial) Battalion, The Royal Welch Fusiliers formed in TAVR III with HQ at Wrexham: | . |
| . | A Company at Mold | . |
| . | B Company at Wrexham | . |
| 1969.04.01 | TAVR III element reduced to cadre as 4th Battalion, The Royal Welch Fusiliers at Wrexham, sponsored by Welsh Volunteers | . |
| 1971.04.01 | North Wales companies of Welsh Volunteers and cadres of former TAVR III units reorganised to form 3rd (Volunteer) Battalion, The Royal Welch Fusiliers | . |
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| . | 6th/7th Battalion, The Royal Welch Fusiliers | . |
| 1956.07.01 | 446th (Royal Welch) Airborne Light Anti-Aircraft Regiment, RA converted, constituting the infantry for Caernarvonshire, Anglesey, Merioneth and Montgomery | . |
| 1967.04.01 | Disbanded and concurrently re-formed as 6th/7th (Territorial) Battalion, The Royal Welch Fusiliers in TAVR III with HQ at Caernarvon, less some personnel to A Company (Royal Welch Fusiliers), Welsh Volunteers at Wrexham | . |
| . | A Company at Caernarvon | . |
| . | C Company at Aberystwyth | . |
| . | B Company at Caernarvon | . |
| 1969.04.01 | Reduced to cadre as 6th/7th Battalion, The Royal Welch Fusiliers at Caernarvon, sponsored by Welsh Volunteers; also formed D Company (Royal Welch Fusiliers) Welsh Volunteers at Caernarvon and Aberystwyth | . |
| 1971.04.01 | North Wales companies of Welsh Volunteers and cadres of former TAVR III units reorganised to form 3rd (Volunteer) Battalion The Royal Welch Fusiliers | . |
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