The capacity to deploy and sustain forces beyond the border on combat, stabilisation, peace-support and disaster-relief operations.
The Capability Development Index tracks the events that move a capability — operational use, technical breakthroughs, procurement decisions and the industrial base behind them — and places each on the record with the date it happened.
Recent developments cover the current period. Historical developments are the inflection points that produced Expeditionary & Peace Operations as it stands today.
Between 127 and 119 BC the Han commanders Wei Qing and Huo Qubing recorded multiple successful expeditions far beyond settled territory, driving the Xiongnu from the Qilian Mountains. Huo Qubing is said to have covered some 2,000 li, roughly 1,000 km, during a single raid, demonstrating an early capacity for sustained operations at great distance from base.
The Sixth Crusade of 1228 is cited as the point at which expeditionary operations incorporated political alliance into military strategy. This added a diplomatic dimension to campaigns conducted far from home territory.
Weak Ming resistance to wokou coastal raiding encouraged Japan to mount full-scale overseas invasions of Korea between 1592 and 1598. The campaigns marked a transition from opportunistic raiding to planned expeditionary warfare across the sea.
The British Expeditionary Force of 1914, the Russian Expeditionary Force of 1916 and the American Expeditionary Forces of 1917 established expeditionary warfare as systematic, planned operations rather than simple troop transport. Dominion and allied contingents from Canada, Australia, India, New Zealand, South Africa, Portugal, Brazil, Italy, Siam and Japan followed the same pattern through 1921.
The unsuccessful Gallipoli landing marked the beginnings of true combined operations at strategic, operational and tactical levels. Despite its failure, it shaped later doctrine for projecting force across water onto hostile shores.
The decade after the First World War consolidated expeditionary operations into a doctrine with larger scope than ad hoc deployments. This institutionalisation underpinned the later concept of rapid deployment forces.