When historians recount the great conflicts of modern history, the narrative gravitates toward generals, weapons, and tactical brilliance. But there is a quieter, more fundamental truth that financial professionals have long understood: wars are won and lost in the ledgers of banks before a single shot is fired on the field. Every shell launched, every drone deployed, every factory retooled from producing consumer goods to manufacturing artillery components — each of these actions carries a price tag, and someone must foot the bill. That someone, at its most fundamental level, is the banking system.
This argument, advanced by veteran fintech commentator Chris Skinner on his influential The Finanser blog, cuts to the core of an underappreciated dynamic in geopolitical analysis: the primacy of financial infrastructure over military hardware in determining the outcome of sustained conflict. It is a thesis that deserves serious treatment in the pages of any publication covering the intersection of finance and global affairs.
The Machinery of War Finance
The mechanics are straightforward, even if their implications are vast. When a nation mobilizes for war, government expenditure surges far beyond what tax revenues can sustain in the near term. The gap is bridged through sovereign debt issuance — governments selling bonds to domestic and international investors, effectively borrowing against the future prosperity of their citizens. This mechanism is as old as modern statehood itself. Britain financed the Napoleonic Wars through the bond markets of the City of London. The United States funded both World Wars through successive Liberty Bond campaigns that drew in tens of millions of ordinary savers. The instrument changes; the logic does not.
Central banks occupy the second pillar of this architecture. When sovereign bond markets face stress — when yields spike, investor appetite falters, or currency pressures mount — it falls to the central bank to manage liquidity and maintain the flow of credit throughout the broader economy. In practice, this means that institutions such as the European Central Bank or the Bank for International Settlements framework becomes not merely a monetary policy tool but a strategic instrument of national resilience. A central bank that loses credibility or capacity during wartime does not merely produce inflation — it can collapse the entire economic foundation upon which the war effort rests.
Commercial Banks as Strategic Assets
Commercial banks form the third — and arguably most granular — layer of wartime financial architecture. Defense contractors must be paid. Supply chains must be financed. Payrolls for an expanded military-industrial workforce must clear. None of this happens without functioning commercial credit markets. When a factory that previously assembled household appliances receives a government contract to produce artillery shells, that industrial conversion does not happen overnight, nor does it happen without working capital loans, equipment financing, and trade credit facilities extended by commercial lenders. The bank, in this framing, is as much a strategic actor as the defense ministry issuing the contract.
This dynamic also explains why financial sanctions have emerged as one of the primary instruments of modern geopolitical power. Cutting a nation off from the SWIFT interbank messaging network, freezing sovereign reserves, or restricting access to dollar-denominated correspondent banking does not merely inconvenience an adversary — it attacks the very financial plumbing through which war is financed and sustained. The weapon, in this case, is access to the global banking system itself.
Defence Spending and the Pressure on Financial Institutions
The relevance of Skinner's thesis is sharpened considerably by the current geopolitical environment. Across Europe, governments are committing to significant increases in defense budgets, pressuring both sovereign balance sheets and the commercial banking sectors that must intermediate that spending. The question of whether European banks — many of which spent the post-2008 era shrinking their balance sheets and retreating from complexity — are equipped to serve as efficient conduits for a rearmament cycle of this scale is one that regulators, treasuries, and bank boards are only beginning to grapple with seriously.
There is also the question of ESG (Environmental, Social, and Governance) investment frameworks and their interaction with defense financing. A number of major European lenders have, over the past decade, adopted exclusionary policies that restrict or prohibit lending to certain categories of arms manufacturers. As the political consensus shifts — with governments explicitly calling on financial institutions to support defense industrial capacity — those frameworks are coming under intense pressure. The bank that yesterday declined to finance a missile manufacturer on ethical grounds may tomorrow find itself under regulatory or political pressure to reverse that stance in the name of national security.
What This Means for the Banking Sector
Skinner's framing arrives at a moment when the relationship between finance and geopolitics is being fundamentally renegotiated. For banking executives, boards, and regulators, the implication is clear: financial institutions are not neutral intermediaries standing apart from the great power competitions of the age. They are, whether they choose to acknowledge it or not, active participants in determining which side of a conflict has the resources to prevail.
That responsibility carries weight that extends well beyond credit risk modelling and capital adequacy ratios. The banks that understand their own strategic significance — and build the operational resilience, regulatory relationships, and geopolitical literacy to function effectively in this environment — will be the institutions that matter most in the decade ahead. Wars, as the old truth goes, may be started by politicians and fought by soldiers. But they have always, in the end, been won by banks.
Written by the editorial team — independent journalism powered by Codego Press.