Collective security: aggressor states would face the combined response of all League members, in theory making war too costly to risk.
Disarmament: the peace treaties had already forced Germany to disarm, and the League was supposed to oversee a matching reduction in armaments among all members.
Peaceful settlement of disputes: member states were expected to settle disagreements through arbitration rather than force.
International cooperation: specialized agencies would improve cooperation on economic, social, and humanitarian questions.
Structure: Assembly, Council, Secretariat
The Assembly: included all member states, each with one vote, and met annually in Geneva, where the League had begun work in 1920.
The Council: dominated by its permanent members, Britain, France, Italy, and Japan, plus rotating seats, and handled security crises.
The unanimity rule: decisions in both the Assembly and the Council required unanimity, meaning any single member could block collective action.
The Secretariat: based in Geneva, managed the League's day-to-day administrative operations under its first Secretary General, Sir Eric Drummond, who built a professional international civil service expected to serve the League rather than national governments.
The League's Humanitarian and Technical Agencies
The International Labour Organization (ILO): set minimum working standards for member states.
The Health Organization: the predecessor of the World Health Organization, coordinated responses to disease outbreaks, including a typhus epidemic in Eastern Europe.
The Refugees Commission: led by Fridtjof Nansen, organized the repatriation of 450,000 prisoners of war after 1918 and issued the "Nansen passport" to stateless refugees.
The mandates system: supervised former German and Ottoman colonial territories on behalf of the Allied powers, creating a framework of international accountability, however limited, over colonial rule.
Historiography
Susan Pedersen: in "The Guardians" (2015) argues the mandates system, often dismissed as window-dressing for imperialism, in fact created a genuine international forum where mandatory powers had to justify their conduct.
F.S. Northedge: in "The League of Nations: Its Life and Times" (1986) argues the League's structural design, the unanimity rule, no standing military, and dependence on great-power goodwill, doomed it once the great powers themselves turned aggressive.
Ruth Henig: contends the League's early institutional achievements, the ILO, the Health Organization, mandates oversight, show the organisation functioned well wherever it did not have to coerce a determined great power.
Judgement: the League's structure suited technical cooperation but was built for consensus, not enforcement. Its humanitarian record and its collective-security record are best judged separately, not as a single verdict on the whole institution.
The Covenant: Legal Obligations and Sanctions
The Covenant of the League: formed Part I of the Treaty of Versailles, so all its signatories were automatically bound by League obligations.
Article 10: required members to respect and preserve the territorial integrity and political independence of all other members.
Articles 12 to 15: required states to submit disputes to arbitration, judicial settlement, or Council inquiry before resorting to force.
Article 8: called for national armaments to fall to the lowest level consistent with national safety, the legal basis for the League's disarmament work.
Article 16: described economic sanctions, cutting trade, finance, transport, and communication with an aggressor, as the League's main response to a member that resorted to illegal war.
The gap between law and enforcement: the Council could also recommend military contributions from members, but the League had no standing armed force of its own, so every sanction and every soldier depended on a national government choosing to act.
The World Disarmament Conference: opened in 1932 but collapsed because Germany demanded equality of armaments while France refused to reduce its own forces without prior security guarantees.
Interactive question
Under Article 16 of the Covenant, what was the League's principal formal response to a member state that resorted to illegal war?
Markscheme
Economic sanctions. Article 16 set out cutting trade, finance, transport, and communication with an aggressor as the League's main response, and the Council could recommend military contributions too. But the League had no standing armed force of its own, so whether sanctions were actually applied depended entirely on individual national governments choosing to act. [1]
The Permanent Court and the Mandates Commission
The Permanent Court of International Justice: began work at The Hague in 1922, issuing judgments in disputes states chose to submit and advisory opinions to League bodies, but without universal compulsory jurisdiction.
Boundary commissions and plebiscites: special commissions investigated disputes and the League used plebiscites and minority petitions to settle contested territory in postwar Europe, such as Upper Silesia.
The Economic and Financial Organization: arranged supervised international loans that stabilized Austria from 1922 and Hungary from 1924 after their postwar economies collapsed.
The Permanent Mandates Commission: required mandatory powers to report on their administration of former German and Ottoman territories, and minority treaties bound several new European states to protect ethnic and religious minorities, though petitions from those minorities were handled cautiously.
Membership: Who Joined, and Who Left
The United States: never joined after the Senate rejected membership, even though President Woodrow Wilson had championed the League's creation, a major blow to its claim to universality.
Germany: joined in 1926 as a permanent Council member during the Locarno period, then announced its withdrawal in 1933 after Hitler came to power.
The Soviet Union: was excluded at first, joined in 1934, and was expelled in December 1939 after invading Finland.
Japan and Italy: Japan left after international criticism of its actions in Manchuria (1933), and Italy withdrew after the Abyssinian crisis (1937).
The consequence: changing membership steadily reduced the League's universality and let aggressive states escape their obligations simply by leaving.
Exam technique
Paper 3: 15 marks, To what extent: "To what extent was the structure of the League of Nations responsible for its failure to maintain collective security in interwar Europe?"
Build the argument: use the unanimity rule, the absence of the USA, a Council dominated by Britain and France, and the lack of a standing army or enforcement mechanism under Article 16.
Evaluate perspectives: weigh Northedge's structural-failure view against Pedersen's more favourable reading of institutional oversight and Henig's point that governments used the League only when it suited their interests.
Active recall
What were the League's four stated aims?
Name the League's three main bodies and one function of each.
What rule governed decision-making in the Assembly and Council, and why did it matter?
Which agency did Fridtjof Nansen lead, and what did it accomplish?
What were League mandates, and which territories did they cover?
Definition
Collective security
Collective security is the idea that nations work together to maintain peace by deterring or punishing aggression.