Where logistics is the problem of moving supplies, supply is the problem of obtaining them: taxation in kind, requisition, contracts with private suppliers, and state manufacture. The Roman Republic used publicani, tax-farming contractors, to supply armies; the later empire moved to the annona militaris, a levy in kind.
Pay is part of the same system and reveals it. Roman soldiers were paid in cash with deductions for food, equipment and burial club, which means the state recovered part of the wage as payment for supply. Documents from Egypt record the arithmetic on individual accounts.
The documentary evidence is unusually good. The Vindolanda tablets from northern Britain include strength returns, requests for supplies, and an account of a unit's daily disposition — the ordinary paperwork of a frontier garrison, preserved by waterlogging.
What the evidence supports
Roman soldiers' pay carried deductions for supply.
Recorded on surviving pay accounts from Egypt, which itemise deductions against the stated stipend.
Strength returns and duty rosters survive from a frontier garrison.
The Vindolanda tablets include a strength report for a cohort accounting for men absent on detachment and sick.
The late empire shifted from cash to levy in kind.
The annona militaris is attested in the legal codes and reflects the monetary difficulties of the third century.
Archaeology
Vindolanda, the Egyptian military papyri, and the excavated fabricae, the state arms factories of the later empire, together document supply administration directly.
Primary sources
Roman garrison at Vindolanda, Vindolanda tablets Tab. Vindol. II 154 and others
Strength returns, supply requests and correspondence from a Roman auxiliary garrison.
Polybius, Histories 6.39
Pay, rations and deductions in the mid-Republican army.
Roman imperial administration, Theodosian Code 7
Late imperial legislation on military supply.
Battles
53 BCE
Carrhae
A Roman army was destroyed in open desert by Parthian horse archers and cataphracts, in the clearest ancient demonstration that heavy infantry has no answer to mobile missile cavalry.
378 CE
Adrianople
An eastern Roman field army was destroyed and an emperor killed by a Gothic force outside Adrianople, in a defeat a contemporary historian called the heaviest since Cannae.
How to read the evidence labels
- Evidence level: Documented
- Supported by a named primary text or by excavated material evidence.
- Evidence level: Probable
- Supported by strong inference that most specialists accept.
- Evidence level: Disputed
- Substantial specialist disagreement exists; competing readings are stated.
- Evidence level: Literary
- Belongs to poetic or mythological construction rather than to history.
- Evidence level: Mythological
- Belongs to shared religious or mythic tradition rather than to any single text.
- Evidence level: Unknown
- The available evidence is insufficient to decide.
These labels describe the status of the evidence, not our confidence in a conclusion. A claim marked Literary is not a claim we doubt; it is a claim about what kind of thing a poem is.