Irish Civil War vs Spanish–American War

The National Army successfully pivoted from conventional offensive to counter-guerrilla operations, escalating pressure through execution powers and internment camps. The IRA, conversely, failed to generate strategic objectives in the guerrilla phase.

The U.S. flexibly applied joint land-sea operational doctrine, while Spain remained fixed in static fortress defense and could not transition to dynamic maneuver.

Attrition War — After the rapid conclusion of the conventional phase, the war evolved into a classic asymmetric attrition conflict driven by guerrilla tactics and counter-insurgency operations.

War of Annihilation — The U.S. broke colonial will by totally destroying the Spanish fleets at Manila and Santiago.

The State's Schwerpunkt was Dublin and then the urban hubs of Munster — accurately identified and neutralised in sequence. The Republicans failed to define their own centre of gravity and dispersed forces.

The U.S. correctly identified the destruction of Spanish fleets as the center of gravity, automatically resolving land operations. Spain failed to determine its Schwerpunkt and resorted to fragmented defense.

The State's amphibious landings (Passage West, Fenit) constituted complete strategic surprise and shattered the southern Republican defence. The IRA's deception capacity remained very limited.

Dewey's nighttime infiltration of Manila Bay was a classic surprise maneuver; Spanish coastal batteries were destroyed before they could go on alert.

Deployment of 18-pounder field artillery during the Four Courts siege and subsequent fortress reductions delivered psychological shock effects. Armoured cars proved decisive in urban combat.

At Manila Bay, Dewey's rapid-fire artillery annihilated the Spanish fleet within hours, demonstrating absolute fire superiority.

The rugged terrain of Munster and Connacht initially favoured guerrilla operations, yet the State's amphibious landings (Cork, Kerry) neutralised geography. Winter conditions wore down both sides equally.

Caribbean summer storm season and tropical disease wore down both sides; however, the U.S. minimized climatic friction through geographic proximity advantage.

The intelligence capital accumulated during the War of Independence largely remained with the pro-Treaty side; Republicans were known by their former comrades-in-arms. This asymmetry proved fatal in the guerrilla phase.

U.S. naval attachés had mapped the Spanish fleet inventory years in advance, while Spain remained unaware of the U.S. Pacific operational plan.

The National Army exploited interior lines through amphibious envelopments into Munster, outflanking Republican positions from the rear. The IRA failed to achieve operational manoeuvre and reverted to static defence.

The U.S. Navy demonstrated strategic mobility between two oceans, executing Dewey's rapid transit from Hong Kong to Manila; Spain failed to leverage interior lines.

Collins' assassination at Béal na Bláth in August 1922 caused brief shock within State ranks but converted into vengeance-driven motivation. Republicans, burdened by the weight of fratricidal warfare, grew progressively demoralised.

American public entered the war with high motivation fueled by yellow journalism, while the Spanish military was crushed under the psychological weight of the 'honorable defeat' doctrine.

By legitimising the Treaty through plebiscite, the Free State politically isolated the Republicans. The Catholic Church's excommunication threat and public war fatigue inflicted moral damage greater than any battlefield engagement.

The U.S. exploited Spanish attrition in Cuba and diplomatic isolation pre-war, pushing Madrid into defensive posture; the Guam commander surrendered without even hearing of the war.