| 1866: | 40th “Northumberland” Battalion │ |
46th “East Durham” Battalion │ |
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| 1897: | │ │ |
46th “Durham” Battalion │ |
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| 1900: | 40th Northumberland Regiment | 46th Durham Regiment | |||
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| 1920: | 1st Battalion (139th Battalion, CEF), |
2nd Battalion (235th Battalion, CEF), |
1st Battalion (136th Battalion, CEF), |
2nd Battalion, | |
| The Northumberland (Ontario) Regiment | The Durham Regiment | ||||
| [Non Permanent Active Militia] | [Reserve] | [Non Permanent Active Militia] | [Reserve] | ||
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| │ | │ | │ | │ | ||
| 1926: | 1st Battalion (39th Battalion, CEF), |
2nd Battalion (139th Battalion, CEF), |
│ │ |
│ │ |
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| The Northumberland (Ontario) Regiment | │ | │ | |||
| │ | │ | │ | │ | ||
| 1936: | │ │ |
disbanded | │ │ |
disbanded | |
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| The Midland Regiment (Northumberland and Durham) |
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| 1940: | 2nd (Reserve) Battalion, | 1st Battalion, | |||
| The Midland Regiment (Northumberland and Durham) |
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| │ │ |
[Canadian Active Service Force] │ |
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| 1945: | The Midland Regiment (Northumberland and Durham) │ |
disbanded | |||
| 1946: | The Midland Regiment │ |
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| 1954: | merged into The Hastings and Prince Edward Regiment |
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| Overseas battalions of the Canadian Expeditionary Force perpetuated by The Hastings and Prince Edward Regiment |
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| 39th Battalion | 139th (Northumberland) Battalion | 136th (Durham) Battalion | |||
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