British policy in Spanish waters exposed the Royal Navy's broader interwar weakness. Non-intervention required it to protect legitimate trade and discourage arms shipments while preventing Spain from triggering a general European war. German warships and Italian submarines added to the burden as the armed services competed for limited defence funds. Post-1919 cuts, Washington treaty limits, and the Ten Year Rule explain why London saw escalation as a danger in its own right.
Chapter · 5:08-6:05
Non-intervention stretched a weakened Royal Navy
The Spanish Civil War tested British non-intervention: the Royal Navy had to protect legitimate trade and restrain arms traffic without turning a regional war into a wider European conflict.